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Published: Jun 19, 2020 License: Unlicense Imports: 32 Imported by: 12



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A minimalist Go module proxy handler.

Goproxy has fully implemented the Go's module proxy protocol. Our goal is to find the most dead simple way to provide a minimalist handler that can act as a full-featured Go module proxy for those who want to build their own proxies. Yeah, there is no Makefile, no configuration files, no crazy file organization, no lengthy documentation, no annoying stuff, just a goproxy.Goproxy that implements the http.Handler.



Open your terminal and execute

$ go get


The only requirement is the Go, at least v1.13.

Quick Start

Create a file named goproxy.go

package main

import (


func main() {
	http.ListenAndServe("localhost:8080", goproxy.New())

and run it

$ go run goproxy.go

then try it by setting GOPROXY to http://localhost:8080 by following the instructions below. In addition, we also recommend that you set GO111MODULE to on instead of auto when you are working with Go modules.

Open your terminal and execute

$ go env -w GOPROXY=http://localhost:8080,direct


macOS or Linux

Open your terminal and execute

$ export GOPROXY=http://localhost:8080


$ echo "export GOPROXY=http://localhost:8080" >> ~/.profile && source ~/.profile



Open your PowerShell and execute

C:\> $env:GOPROXY = "http://localhost:8080"


1. Open the Start Search, type in "env"
2. Choose the "Edit the system environment variables"
3. Click the "Environment Variables…" button
4. Under the "User variables for <YOUR_USERNAME>" section (the upper half)
5. Click the "New..." button
6. Choose the "Variable name" input bar, type in "GOPROXY"
7. Choose the "Variable value" input bar, type in "http://localhost:8080"
8. Click the "OK" button



If you want to discuss Goproxy, or ask questions about it, simply post questions or ideas here.


If you want to help build Goproxy, simply follow this to send pull requests here.


This project is licensed under the Unlicense.

License can be found here.



Package goproxy implements a minimalist Go module proxy handler.



This section is empty.


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var ErrCacheNotFound = errors.New("cache not found")

ErrCacheNotFound is the error resulting if a path search failed to find a cache.


This section is empty.


type Cache

type Cache interface {

	// Name returns the unique Unix path style name of the underlying cache.
	Name() string

	// MIMEType returns the MIME type of the underlying cache.
	MIMEType() string

	// Size returns the length in bytes of the underlying cache.
	Size() int64

	// ModTime returns the modification time of the underlying cache.
	ModTime() time.Time

	// Checksum returns the checksum of the underlying cache.
	Checksum() []byte

Cache is the cache unit of the `Cacher`.

type Cacher

type Cacher interface {
	// NewHash returns a new instance of the `hash.Hash` used to compute the
	// checksums of the caches in the underlying cacher.
	NewHash() hash.Hash

	// Cache returns the matched `Cache` for the name from the underlying
	// cacher. It returns the `ErrCacheNotFound` if not found.
	// It is the caller's responsibility to close the returned `Cache`.
	Cache(ctx context.Context, name string) (Cache, error)

	// SetCache sets the c to the underlying cacher.
	// It is the caller's responsibility to close the c.
	SetCache(ctx context.Context, c Cache) error

Cacher is the interface that defines a set of methods used to cache module files for the `Goproxy`.

If you are looking for some useful implementations of the `Cacher`, simply visit the "" package.

type Goproxy

type Goproxy struct {
	// GoBinName is the name of the Go binary.
	// Default value: "go"
	GoBinName string `mapstructure:"go_bin_name"`

	// GoBinEnv is the environment of the Go binary. Each entry is of the
	// form "key=value".
	// If the `GoBinEnv` contains duplicate environment keys, only the last
	// value in the slice for each duplicate key is used.
	// Default value: `os.Environ()`
	GoBinEnv []string `mapstructure:"go_bin_env"`

	// GoBinMaxWorkers is the maximum number of the Go binary commands that
	// are allowed to execute at the same time.
	// If the `GoBinMaxWorkers` is zero, then there will be no limitations.
	// Default value: 0
	GoBinMaxWorkers int `mapstructure:"go_bin_max_workers"`

	// PathPrefix is the prefix of all request paths. It will be used to
	// trim the request paths via the `strings.TrimPrefix`.
	// Note that when the `PathPrefix` is not empty, then it should start
	// with "/".
	// Default value: ""
	PathPrefix string `mapstructure:"path_prefix"`

	// Cacher is the `Cacher` that used to cache module files.
	// If the `Cacher` is nil, the module files will be temporarily stored
	// in the local disk and discarded as the request ends.
	// Default value: nil
	Cacher Cacher `mapstructure:"cacher"`

	// CacherMaxCacheBytes is the maximum number of bytes of the cache that
	// will be stored in the `Cacher`.
	// If the `CacherMaxCacheBytes` is zero, then there will be no
	// limitations.
	// Default value: 0
	CacherMaxCacheBytes int `mapstructure:"cacher_max_cache_bytes"`

	// ProxiedSUMDBs is the proxied checksum databases. Each value should be
	// given the format of "<sumdb-name>" or "<sumdb-name> <sumdb-URL>". The
	// first format can be seen as a shorthand for the second format. In the
	// case of the first format, the corresponding checksum database URL
	// will be the checksum database name itself as a host with an "https"
	// scheme.
	// Default value: nil
	ProxiedSUMDBs []string `mapstructure:"proxied_sumdbs"`

	// InsecureMode indicates whether the insecure mode is enabled.
	// If the `InsecureMode` is true, TLS accepts any certificate presented
	// by the server and any host name in that certificate.
	InsecureMode bool `mapstructure:"insecure_mode"`

	// ErrorLogger is the `log.Logger` that logs errors that occur while
	// proxying.
	// If the `ErrorLogger` is nil, logging is done via the "log" package's
	// standard logger.
	// Default value: nil
	ErrorLogger *log.Logger `mapstructure:"-"`
	// contains filtered or unexported fields

Goproxy is the top-level struct of this project.

Note that the `Goproxy` will not mess with your environment variables, it will still follow your GOPROXY, GONOPROXY, GOSUMDB, GONOSUMDB, and GOPRIVATE. It means that you can set GOPROXY to serve the `Goproxy` itself under other proxies, and by setting GONOPROXY and GOPRIVATE to indicate which modules the `Goproxy` should download directly instead of using those proxies. And of course, you can also set GOSUMDB, GONOSUMDB, and GOPRIVATE to indicate how the `Goproxy` should verify the modules.

It is highly recommended not to modify the value of any field of the `Goproxy` after calling the `Goproxy.ServeHTTP`, which will cause unpredictable problems.

The new instances of the `Goproxy` should only be created by calling the `New`.

func New

func New() *Goproxy

New returns a new instance of the `Goproxy` with default field values.

The `New` is the only function that creates new instances of the `Goproxy` and keeps everything working.

func (*Goproxy) ServeHTTP

func (g *Goproxy) ServeHTTP(rw http.ResponseWriter, r *http.Request)

ServeHTTP implements the `http.Handler`.


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