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Published: Oct 27, 2022 License: BSD-3-Clause Imports: 24 Imported by: 0




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const (
	StatusContinue           = 100 // RFC 7231, 6.2.1
	StatusSwitchingProtocols = 101 // RFC 7231, 6.2.2
	StatusProcessing         = 102 // RFC 2518, 10.1
	StatusEarlyHints         = 103 // RFC 8297

	StatusOK                   = 200 // RFC 7231, 6.3.1
	StatusCreated              = 201 // RFC 7231, 6.3.2
	StatusAccepted             = 202 // RFC 7231, 6.3.3
	StatusNonAuthoritativeInfo = 203 // RFC 7231, 6.3.4
	StatusNoContent            = 204 // RFC 7231, 6.3.5
	StatusResetContent         = 205 // RFC 7231, 6.3.6
	StatusPartialContent       = 206 // RFC 7233, 4.1
	StatusMultiStatus          = 207 // RFC 4918, 11.1
	StatusAlreadyReported      = 208 // RFC 5842, 7.1
	StatusIMUsed               = 226 // RFC 3229, 10.4.1

	StatusMultipleChoices  = 300 // RFC 7231, 6.4.1
	StatusMovedPermanently = 301 // RFC 7231, 6.4.2
	StatusFound            = 302 // RFC 7231, 6.4.3
	StatusSeeOther         = 303 // RFC 7231, 6.4.4
	StatusNotModified      = 304 // RFC 7232, 4.1
	StatusUseProxy         = 305 // RFC 7231, 6.4.5

	StatusTemporaryRedirect = 307 // RFC 7231, 6.4.7
	StatusPermanentRedirect = 308 // RFC 7538, 3

	StatusBadRequest                   = 400 // RFC 7231, 6.5.1
	StatusUnauthorized                 = 401 // RFC 7235, 3.1
	StatusPaymentRequired              = 402 // RFC 7231, 6.5.2
	StatusForbidden                    = 403 // RFC 7231, 6.5.3
	StatusNotFound                     = 404 // RFC 7231, 6.5.4
	StatusMethodNotAllowed             = 405 // RFC 7231, 6.5.5
	StatusNotAcceptable                = 406 // RFC 7231, 6.5.6
	StatusProxyAuthRequired            = 407 // RFC 7235, 3.2
	StatusRequestTimeout               = 408 // RFC 7231, 6.5.7
	StatusConflict                     = 409 // RFC 7231, 6.5.8
	StatusGone                         = 410 // RFC 7231, 6.5.9
	StatusLengthRequired               = 411 // RFC 7231, 6.5.10
	StatusPreconditionFailed           = 412 // RFC 7232, 4.2
	StatusRequestEntityTooLarge        = 413 // RFC 7231, 6.5.11
	StatusRequestURITooLong            = 414 // RFC 7231, 6.5.12
	StatusUnsupportedMediaType         = 415 // RFC 7231, 6.5.13
	StatusRequestedRangeNotSatisfiable = 416 // RFC 7233, 4.4
	StatusExpectationFailed            = 417 // RFC 7231, 6.5.14
	StatusTeapot                       = 418 // RFC 7168, 2.3.3
	StatusMisdirectedRequest           = 421 // RFC 7540, 9.1.2
	StatusUnprocessableEntity          = 422 // RFC 4918, 11.2
	StatusLocked                       = 423 // RFC 4918, 11.3
	StatusFailedDependency             = 424 // RFC 4918, 11.4
	StatusTooEarly                     = 425 // RFC 8470, 5.2.
	StatusUpgradeRequired              = 426 // RFC 7231, 6.5.15
	StatusPreconditionRequired         = 428 // RFC 6585, 3
	StatusTooManyRequests              = 429 // RFC 6585, 4
	StatusRequestHeaderFieldsTooLarge  = 431 // RFC 6585, 5
	StatusUnavailableForLegalReasons   = 451 // RFC 7725, 3

	StatusInternalServerError           = 500 // RFC 7231, 6.6.1
	StatusNotImplemented                = 501 // RFC 7231, 6.6.2
	StatusBadGateway                    = 502 // RFC 7231, 6.6.3
	StatusServiceUnavailable            = 503 // RFC 7231, 6.6.4
	StatusGatewayTimeout                = 504 // RFC 7231, 6.6.5
	StatusHTTPVersionNotSupported       = 505 // RFC 7231, 6.6.6
	StatusVariantAlsoNegotiates         = 506 // RFC 2295, 8.1
	StatusInsufficientStorage           = 507 // RFC 4918, 11.5
	StatusLoopDetected                  = 508 // RFC 5842, 7.2
	StatusNotExtended                   = 510 // RFC 2774, 7
	StatusNetworkAuthenticationRequired = 511 // RFC 6585, 6

HTTP status codes as registered with IANA. See:

View Source
const TimeFormat = "Mon, 02 Jan 2006 15:04:05 GMT"

TimeFormat is the time format to use when generating times in HTTP headers. It is like time.RFC1123 but hard-codes GMT as the time zone. The time being formatted must be in UTC for Format to generate the correct format.

For parsing this time format, see ParseTime.


View Source
var DefaultClient = &Client{}

DefaultClient is the default Client and is used by Get, Head, and Post.

View Source
var DefaultServeMux = &defaultServeMux

DefaultServeMux is the default ServeMux used by Serve.

View Source
var ErrNoCookie = errors.New("http: named cookie not present")

ErrNoCookie is returned by Request's Cookie method when a cookie is not found.

View Source
var NoBody = noBody{}

NoBody is an io.ReadCloser with no bytes. Read always returns EOF and Close always returns nil. It can be used in an outgoing client request to explicitly signal that a request has zero bytes. An alternative, however, is to simply set Request.Body to nil.


func CanonicalHeaderKey

func CanonicalHeaderKey(s string) string

CanonicalHeaderKey returns the canonical format of the header key s. The canonicalization converts the first letter and any letter following a hyphen to upper case; the rest are converted to lowercase. For example, the canonical key for "accept-encoding" is "Accept-Encoding". If s contains a space or invalid header field bytes, it is returned without modifications.

func Error

func Error(w ResponseWriter, error string, code int)

Error replies to the request with the specified error message and HTTP code. It does not otherwise end the request; the caller should ensure no further writes are done to w. The error message should be plain text.

func Handle

func Handle(pattern string, handler Handler)

Handle registers the handler for the given pattern in the DefaultServeMux. The documentation for ServeMux explains how patterns are matched.

func HandleFunc

func HandleFunc(pattern string, handler func(ResponseWriter, *Request))

HandleFunc registers the handler function for the given pattern in the DefaultServeMux. The documentation for ServeMux explains how patterns are matched.

func ListenAndServe

func ListenAndServe(addr string, handler Handler) error

ListenAndServe listens on the TCP network address addr and then calls Serve with handler to handle requests on incoming connections. Accepted connections are configured to enable TCP keep-alives.

The handler is typically nil, in which case the DefaultServeMux is used.

ListenAndServe always returns a non-nil error.

func MaxBytesReader

func MaxBytesReader(w ResponseWriter, r io.ReadCloser, n int64) io.ReadCloser

MaxBytesReader is similar to io.LimitReader but is intended for limiting the size of incoming request bodies. In contrast to io.LimitReader, MaxBytesReader's result is a ReadCloser, returns a non-EOF error for a Read beyond the limit, and closes the underlying reader when its Close method is called.

MaxBytesReader prevents clients from accidentally or maliciously sending a large request and wasting server resources.

func NotFound

func NotFound(w ResponseWriter, r *Request)

NotFound replies to the request with an HTTP 404 not found error.

func ParseHTTPVersion

func ParseHTTPVersion(vers string) (major, minor int, ok bool)

ParseHTTPVersion parses an HTTP version string. "HTTP/1.0" returns (1, 0, true).

func ParseTime

func ParseTime(text string) (t time.Time, err error)

ParseTime parses a time header (such as the Date: header), trying each of the three formats allowed by HTTP/1.1: TimeFormat, time.RFC850, and time.ANSIC.

func Redirect

func Redirect(w ResponseWriter, r *Request, url string, code int)

Redirect replies to the request with a redirect to url, which may be a path relative to the request path.

The provided code should be in the 3xx range and is usually StatusMovedPermanently, StatusFound or StatusSeeOther.

If the Content-Type header has not been set, Redirect sets it to "text/html; charset=utf-8" and writes a small HTML body. Setting the Content-Type header to any value, including nil, disables that behavior.

func SetBuf

func SetBuf(b []byte)

func SetCookie

func SetCookie(w ResponseWriter, cookie *Cookie)

SetCookie adds a Set-Cookie header to the provided ResponseWriter's headers. The provided cookie must have a valid Name. Invalid cookies may be silently dropped.

func StatusText

func StatusText(code int) string

StatusText returns a text for the HTTP status code. It returns the empty string if the code is unknown.

func UseDriver

func UseDriver(driver DeviceDriver)


type Client

type Client struct {
	// Transport specifies the mechanism by which individual
	// HTTP requests are made.
	// If nil, DefaultTransport is used.
	Transport RoundTripper

	// CheckRedirect specifies the policy for handling redirects.
	// If CheckRedirect is not nil, the client calls it before
	// following an HTTP redirect. The arguments req and via are
	// the upcoming request and the requests made already, oldest
	// first. If CheckRedirect returns an error, the Client's Get
	// method returns both the previous Response (with its Body
	// closed) and CheckRedirect's error (wrapped in a url.Error)
	// instead of issuing the Request req.
	// As a special case, if CheckRedirect returns ErrUseLastResponse,
	// then the most recent response is returned with its body
	// unclosed, along with a nil error.
	// If CheckRedirect is nil, the Client uses its default policy,
	// which is to stop after 10 consecutive requests.
	CheckRedirect func(req *Request, via []*Request) error

	// Jar specifies the cookie jar.
	// The Jar is used to insert relevant cookies into every
	// outbound Request and is updated with the cookie values
	// of every inbound Response. The Jar is consulted for every
	// redirect that the Client follows.
	// If Jar is nil, cookies are only sent if they are explicitly
	// set on the Request.
	Jar CookieJar

	// Timeout specifies a time limit for requests made by this
	// Client. The timeout includes connection time, any
	// redirects, and reading the response body. The timer remains
	// running after Get, Head, Post, or Do return and will
	// interrupt reading of the Response.Body.
	// A Timeout of zero means no timeout.
	// The Client cancels requests to the underlying Transport
	// as if the Request's Context ended.
	// For compatibility, the Client will also use the deprecated
	// CancelRequest method on Transport if found. New
	// RoundTripper implementations should use the Request's Context
	// for cancellation instead of implementing CancelRequest.
	Timeout time.Duration

A Client is an HTTP client. Its zero value (DefaultClient) is a usable client that uses DefaultTransport.

The Client's Transport typically has internal state (cached TCP connections), so Clients should be reused instead of created as needed. Clients are safe for concurrent use by multiple goroutines.

A Client is higher-level than a RoundTripper (such as Transport) and additionally handles HTTP details such as cookies and redirects.

When following redirects, the Client will forward all headers set on the initial Request except:

• when forwarding sensitive headers like "Authorization", "WWW-Authenticate", and "Cookie" to untrusted targets. These headers will be ignored when following a redirect to a domain that is not a subdomain match or exact match of the initial domain. For example, a redirect from "" to either "" or "" will forward the sensitive headers, but a redirect to "" will not.

• when forwarding the "Cookie" header with a non-nil cookie Jar. Since each redirect may mutate the state of the cookie jar, a redirect may possibly alter a cookie set in the initial request. When forwarding the "Cookie" header, any mutated cookies will be omitted, with the expectation that the Jar will insert those mutated cookies with the updated values (assuming the origin matches). If Jar is nil, the initial cookies are forwarded without change.

func (*Client) Do

func (c *Client) Do(req *Request) (*Response, error)

func (*Client) Get

func (c *Client) Get(url string) (resp *Response, err error)

Get issues a GET to the specified URL. If the response is one of the following redirect codes, Get follows the redirect after calling the Client's CheckRedirect function:

301 (Moved Permanently)
302 (Found)
303 (See Other)
307 (Temporary Redirect)
308 (Permanent Redirect)

An error is returned if the Client's CheckRedirect function fails or if there was an HTTP protocol error. A non-2xx response doesn't cause an error. Any returned error will be of type *url.Error. The url.Error value's Timeout method will report true if the request timed out.

When err is nil, resp always contains a non-nil resp.Body. Caller should close resp.Body when done reading from it.

To make a request with custom headers, use NewRequest and Client.Do.

func (*Client) Post

func (c *Client) Post(url, contentType string, body io.Reader) (resp *Response, err error)

Post issues a POST to the specified URL.

Caller should close resp.Body when done reading from it.

If the provided body is an io.Closer, it is closed after the request.

To set custom headers, use NewRequest and Client.Do.

See the Client.Do method documentation for details on how redirects are handled.

type Cookie struct {
	Name  string
	Value string

	Path       string    // optional
	Domain     string    // optional
	Expires    time.Time // optional
	RawExpires string    // for reading cookies only

	// MaxAge=0 means no 'Max-Age' attribute specified.
	// MaxAge<0 means delete cookie now, equivalently 'Max-Age: 0'
	// MaxAge>0 means Max-Age attribute present and given in seconds
	MaxAge   int
	Secure   bool
	HttpOnly bool
	SameSite SameSite
	Raw      string
	Unparsed []string // Raw text of unparsed attribute-value pairs

A Cookie represents an HTTP cookie as sent in the Set-Cookie header of an HTTP response or the Cookie header of an HTTP request.

See for details.

func (*Cookie) String

func (c *Cookie) String() string

String returns the serialization of the cookie for use in a Cookie header (if only Name and Value are set) or a Set-Cookie response header (if other fields are set). If c is nil or c.Name is invalid, the empty string is returned.

type CookieJar

type CookieJar interface {
	// SetCookies handles the receipt of the cookies in a reply for the
	// given URL.  It may or may not choose to save the cookies, depending
	// on the jar's policy and implementation.
	SetCookies(u *url.URL, cookies []*Cookie)

	// Cookies returns the cookies to send in a request for the given URL.
	// It is up to the implementation to honor the standard cookie use
	// restrictions such as in RFC 6265.
	Cookies(u *url.URL) []*Cookie

A CookieJar manages storage and use of cookies in HTTP requests.

Implementations of CookieJar must be safe for concurrent use by multiple goroutines.

The net/http/cookiejar package provides a CookieJar implementation.

type DeviceDriver

type DeviceDriver interface {
	ListenAndServe(addr string, handler Handler) error
var ActiveDevice DeviceDriver

type Handler

type Handler interface {
	ServeHTTP(ResponseWriter, *Request)

A Handler responds to an HTTP request.

ServeHTTP should write reply headers and data to the ResponseWriter and then return. Returning signals that the request is finished; it is not valid to use the ResponseWriter or read from the Request.Body after or concurrently with the completion of the ServeHTTP call.

Depending on the HTTP client software, HTTP protocol version, and any intermediaries between the client and the Go server, it may not be possible to read from the Request.Body after writing to the ResponseWriter. Cautious handlers should read the Request.Body first, and then reply.

Except for reading the body, handlers should not modify the provided Request.

If ServeHTTP panics, the server (the caller of ServeHTTP) assumes that the effect of the panic was isolated to the active request. It recovers the panic, logs a stack trace to the server error log, and either closes the network connection or sends an HTTP/2 RST_STREAM, depending on the HTTP protocol. To abort a handler so the client sees an interrupted response but the server doesn't log an error, panic with the value ErrAbortHandler.

func NotFoundHandler

func NotFoundHandler() Handler

NotFoundHandler returns a simple request handler that replies to each request with a “404 page not found” reply.

func RedirectHandler

func RedirectHandler(url string, code int) Handler

RedirectHandler returns a request handler that redirects each request it receives to the given url using the given status code.

The provided code should be in the 3xx range and is usually StatusMovedPermanently, StatusFound or StatusSeeOther.

func StripPrefix

func StripPrefix(prefix string, h Handler) Handler

StripPrefix returns a handler that serves HTTP requests by removing the given prefix from the request URL's Path (and RawPath if set) and invoking the handler h. StripPrefix handles a request for a path that doesn't begin with prefix by replying with an HTTP 404 not found error. The prefix must match exactly: if the prefix in the request contains escaped characters the reply is also an HTTP 404 not found error.

type HandlerFunc

type HandlerFunc func(ResponseWriter, *Request)

The HandlerFunc type is an adapter to allow the use of ordinary functions as HTTP handlers. If f is a function with the appropriate signature, HandlerFunc(f) is a Handler that calls f.

func (HandlerFunc) ServeHTTP

func (f HandlerFunc) ServeHTTP(w ResponseWriter, r *Request)

ServeHTTP calls f(w, r).

type Header map[string][]string

A Header represents the key-value pairs in an HTTP header.

The keys should be in canonical form, as returned by CanonicalHeaderKey.

func (Header) Add

func (h Header) Add(key, value string)

Add adds the key, value pair to the header. It appends to any existing values associated with key. The key is case insensitive; it is canonicalized by CanonicalHeaderKey.

func (Header) Clone

func (h Header) Clone() Header

Clone returns a copy of h or nil if h is nil.

func (Header) Del

func (h Header) Del(key string)

Del deletes the values associated with key. The key is case insensitive; it is canonicalized by CanonicalHeaderKey.

func (Header) Get

func (h Header) Get(key string) string

Get gets the first value associated with the given key. If there are no values associated with the key, Get returns "". It is case insensitive; textproto.CanonicalMIMEHeaderKey is used to canonicalize the provided key. To use non-canonical keys, access the map directly.

func (Header) Set

func (h Header) Set(key, value string)

Set sets the header entries associated with key to the single element value. It replaces any existing values associated with key. The key is case insensitive; it is canonicalized by textproto.CanonicalMIMEHeaderKey. To use non-canonical keys, assign to the map directly.

func (Header) Values

func (h Header) Values(key string) []string

Values returns all values associated with the given key. It is case insensitive; textproto.CanonicalMIMEHeaderKey is used to canonicalize the provided key. To use non-canonical keys, access the map directly. The returned slice is not a copy.

func (Header) Write

func (h Header) Write(w io.Writer) error

Write writes a header in wire format.

func (Header) WriteSubset

func (h Header) WriteSubset(w io.Writer, exclude map[string]bool) error

WriteSubset writes a header in wire format. If exclude is not nil, keys where exclude[key] == true are not written. Keys are not canonicalized before checking the exclude map.

type PushOptions

type PushOptions struct {
	// Method specifies the HTTP method for the promised request.
	// If set, it must be "GET" or "HEAD". Empty means "GET".
	Method string

	// Header specifies additional promised request headers. This cannot
	// include HTTP/2 pseudo header fields like ":path" and ":scheme",
	// which will be added automatically.
	Header Header

PushOptions describes options for Pusher.Push.

type Pusher

type Pusher interface {
	// Push initiates an HTTP/2 server push. This constructs a synthetic
	// request using the given target and options, serializes that request
	// into a PUSH_PROMISE frame, then dispatches that request using the
	// server's request handler. If opts is nil, default options are used.
	// The target must either be an absolute path (like "/path") or an absolute
	// URL that contains a valid host and the same scheme as the parent request.
	// If the target is a path, it will inherit the scheme and host of the
	// parent request.
	// The HTTP/2 spec disallows recursive pushes and cross-authority pushes.
	// Push may or may not detect these invalid pushes; however, invalid
	// pushes will be detected and canceled by conforming clients.
	// Handlers that wish to push URL X should call Push before sending any
	// data that may trigger a request for URL X. This avoids a race where the
	// client issues requests for X before receiving the PUSH_PROMISE for X.
	// Push will run in a separate goroutine making the order of arrival
	// non-deterministic. Any required synchronization needs to be implemented
	// by the caller.
	// Push returns ErrNotSupported if the client has disabled push or if push
	// is not supported on the underlying connection.
	Push(target string, opts *PushOptions) error

Pusher is the interface implemented by ResponseWriters that support HTTP/2 server push. For more background, see

type Request

type Request struct {
	// Method specifies the HTTP method (GET, POST, PUT, etc.).
	// For client requests, an empty string means GET.
	// Go's HTTP client does not support sending a request with
	// the CONNECT method. See the documentation on Transport for
	// details.
	Method string

	// URL specifies either the URI being requested (for server
	// requests) or the URL to access (for client requests).
	// For server requests, the URL is parsed from the URI
	// supplied on the Request-Line as stored in RequestURI.  For
	// most requests, fields other than Path and RawQuery will be
	// empty. (See RFC 7230, Section 5.3)
	// For client requests, the URL's Host specifies the server to
	// connect to, while the Request's Host field optionally
	// specifies the Host header value to send in the HTTP
	// request.
	URL *url.URL

	// The protocol version for incoming server requests.
	// For client requests, these fields are ignored. The HTTP
	// client code always uses either HTTP/1.1 or HTTP/2.
	// See the docs on Transport for details.
	Proto      string // "HTTP/1.0"
	ProtoMajor int    // 1
	ProtoMinor int    // 0

	// Header contains the request header fields either received
	// by the server or to be sent by the client.
	// If a server received a request with header lines,
	//	Host:
	//	accept-encoding: gzip, deflate
	//	Accept-Language: en-us
	//	fOO: Bar
	//	foo: two
	// then
	//	Header = map[string][]string{
	//		"Accept-Encoding": {"gzip, deflate"},
	//		"Accept-Language": {"en-us"},
	//		"Foo": {"Bar", "two"},
	//	}
	// For incoming requests, the Host header is promoted to the
	// Request.Host field and removed from the Header map.
	// HTTP defines that header names are case-insensitive. The
	// request parser implements this by using CanonicalHeaderKey,
	// making the first character and any characters following a
	// hyphen uppercase and the rest lowercase.
	// For client requests, certain headers such as Content-Length
	// and Connection are automatically written when needed and
	// values in Header may be ignored. See the documentation
	// for the Request.Write method.
	Header Header

	// Body is the request's body.
	// For client requests, a nil body means the request has no
	// body, such as a GET request. The HTTP Client's Transport
	// is responsible for calling the Close method.
	// For server requests, the Request Body is always non-nil
	// but will return EOF immediately when no body is present.
	// The Server will close the request body. The ServeHTTP
	// Handler does not need to.
	// Body must allow Read to be called concurrently with Close.
	// In particular, calling Close should unblock a Read waiting
	// for input.
	Body io.ReadCloser

	// GetBody defines an optional func to return a new copy of
	// Body. It is used for client requests when a redirect requires
	// reading the body more than once. Use of GetBody still
	// requires setting Body.
	// For server requests, it is unused.
	GetBody func() (io.ReadCloser, error)

	// ContentLength records the length of the associated content.
	// The value -1 indicates that the length is unknown.
	// Values >= 0 indicate that the given number of bytes may
	// be read from Body.
	// For client requests, a value of 0 with a non-nil Body is
	// also treated as unknown.
	ContentLength int64

	// TransferEncoding lists the transfer encodings from outermost to
	// innermost. An empty list denotes the "identity" encoding.
	// TransferEncoding can usually be ignored; chunked encoding is
	// automatically added and removed as necessary when sending and
	// receiving requests.
	TransferEncoding []string

	// Close indicates whether to close the connection after
	// replying to this request (for servers) or after sending this
	// request and reading its response (for clients).
	// For server requests, the HTTP server handles this automatically
	// and this field is not needed by Handlers.
	// For client requests, setting this field prevents re-use of
	// TCP connections between requests to the same hosts, as if
	// Transport.DisableKeepAlives were set.
	Close bool

	// For server requests, Host specifies the host on which the
	// URL is sought. For HTTP/1 (per RFC 7230, section 5.4), this
	// is either the value of the "Host" header or the host name
	// given in the URL itself. For HTTP/2, it is the value of the
	// ":authority" pseudo-header field.
	// It may be of the form "host:port". For international domain
	// names, Host may be in Punycode or Unicode form. Use
	// to convert it to either format if
	// needed.
	// To prevent DNS rebinding attacks, server Handlers should
	// validate that the Host header has a value for which the
	// Handler considers itself authoritative. The included
	// ServeMux supports patterns registered to particular host
	// names and thus protects its registered Handlers.
	// For client requests, Host optionally overrides the Host
	// header to send. If empty, the Request.Write method uses
	// the value of URL.Host. Host may contain an international
	// domain name.
	Host string

	// Form contains the parsed form data, including both the URL
	// field's query parameters and the PATCH, POST, or PUT form data.
	// This field is only available after ParseForm is called.
	// The HTTP client ignores Form and uses Body instead.
	Form url.Values

	// PostForm contains the parsed form data from PATCH, POST
	// or PUT body parameters.
	// This field is only available after ParseForm is called.
	// The HTTP client ignores PostForm and uses Body instead.
	PostForm url.Values

	// MultipartForm is the parsed multipart form, including file uploads.
	// This field is only available after ParseMultipartForm is called.
	// The HTTP client ignores MultipartForm and uses Body instead.
	MultipartForm *multipart.Form

	// Trailer specifies additional headers that are sent after the request
	// body.
	// For server requests, the Trailer map initially contains only the
	// trailer keys, with nil values. (The client declares which trailers it
	// will later send.)  While the handler is reading from Body, it must
	// not reference Trailer. After reading from Body returns EOF, Trailer
	// can be read again and will contain non-nil values, if they were sent
	// by the client.
	// For client requests, Trailer must be initialized to a map containing
	// the trailer keys to later send. The values may be nil or their final
	// values. The ContentLength must be 0 or -1, to send a chunked request.
	// After the HTTP request is sent the map values can be updated while
	// the request body is read. Once the body returns EOF, the caller must
	// not mutate Trailer.
	// Few HTTP clients, servers, or proxies support HTTP trailers.
	Trailer Header

	// RemoteAddr allows HTTP servers and other software to record
	// the network address that sent the request, usually for
	// logging. This field is not filled in by ReadRequest and
	// has no defined format. The HTTP server in this package
	// sets RemoteAddr to an "IP:port" address before invoking a
	// handler.
	// This field is ignored by the HTTP client.
	RemoteAddr string

	// RequestURI is the unmodified request-target of the
	// Request-Line (RFC 7230, Section 3.1.1) as sent by the client
	// to a server. Usually the URL field should be used instead.
	// It is an error to set this field in an HTTP client request.
	RequestURI string

	// TLS allows HTTP servers and other software to record
	// information about the TLS connection on which the request
	// was received. This field is not filled in by ReadRequest.
	// The HTTP server in this package sets the field for
	// TLS-enabled connections before invoking a handler;
	// otherwise it leaves the field nil.
	// This field is ignored by the HTTP client.
	TLS *tls.ConnectionState

	// Cancel is an optional channel whose closure indicates that the client
	// request should be regarded as canceled. Not all implementations of
	// RoundTripper may support Cancel.
	// For server requests, this field is not applicable.
	// Deprecated: Set the Request's context with NewRequestWithContext
	// instead. If a Request's Cancel field and context are both
	// set, it is undefined whether Cancel is respected.
	Cancel <-chan struct{}

	// Response is the redirect response which caused this request
	// to be created. This field is only populated during client
	// redirects.
	Response *Response
	// contains filtered or unexported fields

func NewRequest

func NewRequest(method, url string, body io.Reader) (*Request, error)

NewRequest wraps NewRequestWithContext using the background context.

func NewRequestWithContext

func NewRequestWithContext(ctx context.Context, method, url string, body io.Reader) (*Request, error)

NewRequestWithContext returns a new Request given a method, URL, and optional body.

If the provided body is also an io.Closer, the returned Request.Body is set to body and will be closed by the Client methods Do, Post, and PostForm, and Transport.RoundTrip.

NewRequestWithContext returns a Request suitable for use with Client.Do or Transport.RoundTrip. To create a request for use with testing a Server Handler, either use the NewRequest function in the net/http/httptest package, use ReadRequest, or manually update the Request fields. For an outgoing client request, the context controls the entire lifetime of a request and its response: obtaining a connection, sending the request, and reading the response headers and body. See the Request type's documentation for the difference between inbound and outbound request fields.

If body is of type *bytes.Buffer, *bytes.Reader, or *strings.Reader, the returned request's ContentLength is set to its exact value (instead of -1), GetBody is populated (so 307 and 308 redirects can replay the body), and Body is set to NoBody if the ContentLength is 0.

func ReadRequest

func ReadRequest(b *bufio.Reader) (*Request, error)

ReadRequest reads and parses an incoming request from b.

ReadRequest is a low-level function and should only be used for specialized applications; most code should use the Server to read requests and handle them via the Handler interface. ReadRequest only supports HTTP/1.x requests. For HTTP/2, use

func (*Request) AddCookie

func (r *Request) AddCookie(c *Cookie)

AddCookie adds a cookie to the request. Per RFC 6265 section 5.4, AddCookie does not attach more than one Cookie header field. That means all cookies, if any, are written into the same line, separated by semicolon. AddCookie only sanitizes c's name and value, and does not sanitize a Cookie header already present in the request.

func (*Request) Cookie

func (r *Request) Cookie(name string) (*Cookie, error)

Cookie returns the named cookie provided in the request or ErrNoCookie if not found. If multiple cookies match the given name, only one cookie will be returned.

func (*Request) Cookies

func (r *Request) Cookies() []*Cookie

Cookies parses and returns the HTTP cookies sent with the request.

func (*Request) ParseForm

func (r *Request) ParseForm() error

ParseForm populates r.Form and r.PostForm.

For all requests, ParseForm parses the raw query from the URL and updates r.Form.

For POST, PUT, and PATCH requests, it also reads the request body, parses it as a form and puts the results into both r.PostForm and r.Form. Request body parameters take precedence over URL query string values in r.Form.

If the request Body's size has not already been limited by MaxBytesReader, the size is capped at 10MB.

For other HTTP methods, or when the Content-Type is not application/x-www-form-urlencoded, the request Body is not read, and r.PostForm is initialized to a non-nil, empty value.

ParseMultipartForm calls ParseForm automatically. ParseForm is idempotent.

func (*Request) ProtoAtLeast

func (r *Request) ProtoAtLeast(major, minor int) bool

ProtoAtLeast reports whether the HTTP protocol used in the request is at least major.minor.

func (*Request) Referer

func (r *Request) Referer() string

Referer returns the referring URL, if sent in the request.

Referer is misspelled as in the request itself, a mistake from the earliest days of HTTP. This value can also be fetched from the Header map as Header["Referer"]; the benefit of making it available as a method is that the compiler can diagnose programs that use the alternate (correct English) spelling req.Referrer() but cannot diagnose programs that use Header["Referrer"].

func (*Request) UserAgent

func (r *Request) UserAgent() string

UserAgent returns the client's User-Agent, if sent in the request.

type Response

type Response struct {
	Status     string // e.g. "200 OK"
	StatusCode int    // e.g. 200
	Proto      string // e.g. "HTTP/1.0"
	ProtoMajor int    // e.g. 1
	ProtoMinor int    // e.g. 0

	// Header maps header keys to values. If the response had multiple
	// headers with the same key, they may be concatenated, with comma
	// delimiters.  (RFC 7230, section 3.2.2 requires that multiple headers
	// be semantically equivalent to a comma-delimited sequence.) When
	// Header values are duplicated by other fields in this struct (e.g.,
	// ContentLength, TransferEncoding, Trailer), the field values are
	// authoritative.
	// Keys in the map are canonicalized (see CanonicalHeaderKey).
	Header Header

	// Body represents the response body.
	// The response body is streamed on demand as the Body field
	// is read. If the network connection fails or the server
	// terminates the response, Body.Read calls return an error.
	// The http Client and Transport guarantee that Body is always
	// non-nil, even on responses without a body or responses with
	// a zero-length body. It is the caller's responsibility to
	// close Body. The default HTTP client's Transport may not
	// reuse HTTP/1.x "keep-alive" TCP connections if the Body is
	// not read to completion and closed.
	// The Body is automatically dechunked if the server replied
	// with a "chunked" Transfer-Encoding.
	// As of Go 1.12, the Body will also implement io.Writer
	// on a successful "101 Switching Protocols" response,
	// as used by WebSockets and HTTP/2's "h2c" mode.
	Body io.ReadCloser

	// ContentLength records the length of the associated content. The
	// value -1 indicates that the length is unknown. Unless Request.Method
	// is "HEAD", values >= 0 indicate that the given number of bytes may
	// be read from Body.
	ContentLength int64

	// Contains transfer encodings from outer-most to inner-most. Value is
	// nil, means that "identity" encoding is used.
	TransferEncoding []string

	// Close records whether the header directed that the connection be
	// closed after reading Body. The value is advice for clients: neither
	// ReadResponse nor Response.Write ever closes a connection.
	Close bool

	// Uncompressed reports whether the response was sent compressed but
	// was decompressed by the http package. When true, reading from
	// Body yields the uncompressed content instead of the compressed
	// content actually set from the server, ContentLength is set to -1,
	// and the "Content-Length" and "Content-Encoding" fields are deleted
	// from the responseHeader. To get the original response from
	// the server, set Transport.DisableCompression to true.
	Uncompressed bool

	// Trailer maps trailer keys to values in the same
	// format as Header.
	// The Trailer initially contains only nil values, one for
	// each key specified in the server's "Trailer" header
	// value. Those values are not added to Header.
	// Trailer must not be accessed concurrently with Read calls
	// on the Body.
	// After Body.Read has returned io.EOF, Trailer will contain
	// any trailer values sent by the server.
	Trailer Header

	// Request is the request that was sent to obtain this Response.
	// Request's Body is nil (having already been consumed).
	// This is only populated for Client requests.
	Request *Request

	// TLS contains information about the TLS connection on which the
	// response was received. It is nil for unencrypted responses.
	// The pointer is shared between responses and should not be
	// modified.
	TLS *tls.ConnectionState

Response represents the response from an HTTP request.

The Client and Transport return Responses from servers once the response headers have been received. The response body is streamed on demand as the Body field is read.

func Get

func Get(url string) (resp *Response, err error)

Get issues a GET to the specified URL. If the response is one of the following redirect codes, Get follows the redirect, up to a maximum of 10 redirects:

301 (Moved Permanently)
302 (Found)
303 (See Other)
307 (Temporary Redirect)
308 (Permanent Redirect)

An error is returned if there were too many redirects or if there was an HTTP protocol error. A non-2xx response doesn't cause an error. Any returned error will be of type *url.Error. The url.Error value's Timeout method will report true if request timed out or was canceled.

When err is nil, resp always contains a non-nil resp.Body. Caller should close resp.Body when done reading from it.

Get is a wrapper around DefaultClient.Get.

To make a request with custom headers, use NewRequest and DefaultClient.Do.

func Post

func Post(url, contentType string, body io.Reader) (resp *Response, err error)

Post issues a POST to the specified URL.

Caller should close resp.Body when done reading from it.

If the provided body is an io.Closer, it is closed after the request.

Post is a wrapper around DefaultClient.Post.

To set custom headers, use NewRequest and DefaultClient.Do.

See the Client.Do method documentation for details on how redirects are handled.

func (*Response) Cookies

func (r *Response) Cookies() []*Cookie

Cookies parses and returns the cookies set in the Set-Cookie headers.

type ResponseWriter

type ResponseWriter interface {
	// Header returns the header map that will be sent by
	// WriteHeader. The Header map also is the mechanism with which
	// Handlers can set HTTP trailers.
	// Changing the header map after a call to WriteHeader (or
	// Write) has no effect unless the modified headers are
	// trailers.
	// There are two ways to set Trailers. The preferred way is to
	// predeclare in the headers which trailers you will later
	// send by setting the "Trailer" header to the names of the
	// trailer keys which will come later. In this case, those
	// keys of the Header map are treated as if they were
	// trailers. See the example. The second way, for trailer
	// keys not known to the Handler until after the first Write,
	// is to prefix the Header map keys with the TrailerPrefix
	// constant value. See TrailerPrefix.
	// To suppress automatic response headers (such as "Date"), set
	// their value to nil.
	Header() Header

	// Write writes the data to the connection as part of an HTTP reply.
	// If WriteHeader has not yet been called, Write calls
	// WriteHeader(http.StatusOK) before writing the data. If the Header
	// does not contain a Content-Type line, Write adds a Content-Type set
	// to the result of passing the initial 512 bytes of written data to
	// DetectContentType. Additionally, if the total size of all written
	// data is under a few KB and there are no Flush calls, the
	// Content-Length header is added automatically.
	// Depending on the HTTP protocol version and the client, calling
	// Write or WriteHeader may prevent future reads on the
	// Request.Body. For HTTP/1.x requests, handlers should read any
	// needed request body data before writing the response. Once the
	// headers have been flushed (due to either an explicit Flusher.Flush
	// call or writing enough data to trigger a flush), the request body
	// may be unavailable. For HTTP/2 requests, the Go HTTP server permits
	// handlers to continue to read the request body while concurrently
	// writing the response. However, such behavior may not be supported
	// by all HTTP/2 clients. Handlers should read before writing if
	// possible to maximize compatibility.
	Write([]byte) (int, error)

	// WriteHeader sends an HTTP response header with the provided
	// status code.
	// If WriteHeader is not called explicitly, the first call to Write
	// will trigger an implicit WriteHeader(http.StatusOK).
	// Thus explicit calls to WriteHeader are mainly used to
	// send error codes.
	// The provided code must be a valid HTTP 1xx-5xx status code.
	// Only one header may be written. Go does not currently
	// support sending user-defined 1xx informational headers,
	// with the exception of 100-continue response header that the
	// Server sends automatically when the Request.Body is read.
	WriteHeader(statusCode int)

A ResponseWriter interface is used by an HTTP handler to construct an HTTP response.

A ResponseWriter may not be used after the Handler.ServeHTTP method has returned.

type RoundTripper

type RoundTripper interface {
	// RoundTrip executes a single HTTP transaction, returning
	// a Response for the provided Request.
	// RoundTrip should not attempt to interpret the response. In
	// particular, RoundTrip must return err == nil if it obtained
	// a response, regardless of the response's HTTP status code.
	// A non-nil err should be reserved for failure to obtain a
	// response. Similarly, RoundTrip should not attempt to
	// handle higher-level protocol details such as redirects,
	// authentication, or cookies.
	// RoundTrip should not modify the request, except for
	// consuming and closing the Request's Body. RoundTrip may
	// read fields of the request in a separate goroutine. Callers
	// should not mutate or reuse the request until the Response's
	// Body has been closed.
	// RoundTrip must always close the body, including on errors,
	// but depending on the implementation may do so in a separate
	// goroutine even after RoundTrip returns. This means that
	// callers wanting to reuse the body for subsequent requests
	// must arrange to wait for the Close call before doing so.
	// The Request's URL and Header fields must be initialized.
	RoundTrip(*Request) (*Response, error)

RoundTripper is an interface representing the ability to execute a single HTTP transaction, obtaining the Response for a given Request.

A RoundTripper must be safe for concurrent use by multiple goroutines.

type SameSite

type SameSite int

SameSite allows a server to define a cookie attribute making it impossible for the browser to send this cookie along with cross-site requests. The main goal is to mitigate the risk of cross-origin information leakage, and provide some protection against cross-site request forgery attacks.

See for details.

const (
	SameSiteDefaultMode SameSite = iota + 1

type ServeMux

type ServeMux struct {
	// contains filtered or unexported fields

ServeMux is an HTTP request multiplexer. It matches the URL of each incoming request against a list of registered patterns and calls the handler for the pattern that most closely matches the URL.

Patterns name fixed, rooted paths, like "/favicon.ico", or rooted subtrees, like "/images/" (note the trailing slash). Longer patterns take precedence over shorter ones, so that if there are handlers registered for both "/images/" and "/images/thumbnails/", the latter handler will be called for paths beginning "/images/thumbnails/" and the former will receive requests for any other paths in the "/images/" subtree.

Note that since a pattern ending in a slash names a rooted subtree, the pattern "/" matches all paths not matched by other registered patterns, not just the URL with Path == "/".

If a subtree has been registered and a request is received naming the subtree root without its trailing slash, ServeMux redirects that request to the subtree root (adding the trailing slash). This behavior can be overridden with a separate registration for the path without the trailing slash. For example, registering "/images/" causes ServeMux to redirect a request for "/images" to "/images/", unless "/images" has been registered separately.

Patterns may optionally begin with a host name, restricting matches to URLs on that host only. Host-specific patterns take precedence over general patterns, so that a handler might register for the two patterns "/codesearch" and "" without also taking over requests for "".

ServeMux also takes care of sanitizing the URL request path and the Host header, stripping the port number and redirecting any request containing . or .. elements or repeated slashes to an equivalent, cleaner URL.

func NewServeMux

func NewServeMux() *ServeMux

NewServeMux allocates and returns a new ServeMux.

func (*ServeMux) Handle

func (mux *ServeMux) Handle(pattern string, handler Handler)

Handle registers the handler for the given pattern. If a handler already exists for pattern, Handle panics.

func (*ServeMux) HandleFunc

func (mux *ServeMux) HandleFunc(pattern string, handler func(ResponseWriter, *Request))

HandleFunc registers the handler function for the given pattern.

func (*ServeMux) Handler

func (mux *ServeMux) Handler(r *Request) (h Handler, pattern string)

Handler returns the handler to use for the given request, consulting r.Method, r.Host, and r.URL.Path. It always returns a non-nil handler. If the path is not in its canonical form, the handler will be an internally-generated handler that redirects to the canonical path. If the host contains a port, it is ignored when matching handlers.

The path and host are used unchanged for CONNECT requests.

Handler also returns the registered pattern that matches the request or, in the case of internally-generated redirects, the pattern that will match after following the redirect.

If there is no registered handler that applies to the request, Handler returns a “page not found” handler and an empty pattern.

func (*ServeMux) ServeHTTP

func (mux *ServeMux) ServeHTTP(w ResponseWriter, r *Request)

ServeHTTP dispatches the request to the handler whose pattern most closely matches the request URL.


Path Synopsis
Package cookiejar implements an in-memory RFC 6265-compliant http.CookieJar.
Package cookiejar implements an in-memory RFC 6265-compliant http.CookieJar.

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