This server is used by the integration tests as an upstream server.
It simply responds to HTTP GET requests with a canned message that is
then proxied to the test framework via Envoy.
For more info see the build/integration.sh script which runs the
upstream server, and pkg/test/main/main.go for the test
framework that sends and checks the requests.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
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