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// Copyright 2016 The Prometheus Authors
// 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
// limitations under the License.
package httputil
import (
"bytes"
"io"
"net/http"
"net/http/httptest"
"testing"
"github.com/klauspost/compress/gzip"
"github.com/klauspost/compress/zlib"
"github.com/stretchr/testify/require"
)
var (
mux *http.ServeMux
server *httptest.Server
)
func setup() func() {
mux = http.NewServeMux()
server = httptest.NewServer(mux)
return func() {
server.Close()
}
}
func getCompressionHandlerFunc() CompressionHandler {
hf := func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
w.Write([]byte("Hello World!"))
}
return CompressionHandler{
Handler: http.HandlerFunc(hf),
}
}
func TestCompressionHandler_PlainText(t *testing.T) {
tearDown := setup()
defer tearDown()
ch := getCompressionHandlerFunc()
mux.Handle("/foo_endpoint", ch)
client := &http.Client{
Transport: &http.Transport{
DisableCompression: true,
},
}
resp, err := client.Get(server.URL + "/foo_endpoint")
require.NoError(t, err, "client get failed with unexpected error")
defer resp.Body.Close()
contents, err := io.ReadAll(resp.Body)
require.NoError(t, err, "unexpected error while creating the response body reader")
expected := "Hello World!"
actual := string(contents)
require.Equal(t, expected, actual, "expected response with content")
}
func TestCompressionHandler_Gzip(t *testing.T) {
tearDown := setup()
defer tearDown()
ch := getCompressionHandlerFunc()
mux.Handle("/foo_endpoint", ch)
client := &http.Client{
Transport: &http.Transport{
DisableCompression: true,
},
}
req, _ := http.NewRequest(http.MethodGet, server.URL+"/foo_endpoint", nil)
req.Header.Set(acceptEncodingHeader, gzipEncoding)
resp, err := client.Do(req)
require.NoError(t, err, "client get failed with unexpected error")
defer resp.Body.Close()
actualHeader := resp.Header.Get(contentEncodingHeader)
require.Equal(t, gzipEncoding, actualHeader, "unexpected encoding header in response")
var buf bytes.Buffer
zr, err := gzip.NewReader(resp.Body)
require.NoError(t, err, "unexpected error while creating the response body reader")
_, err = buf.ReadFrom(zr)
require.NoError(t, err, "unexpected error while reading the response body")
actual := buf.String()
expected := "Hello World!"
require.Equal(t, expected, actual, "unexpected response content")
}
func TestCompressionHandler_Deflate(t *testing.T) {
tearDown := setup()
defer tearDown()
ch := getCompressionHandlerFunc()
mux.Handle("/foo_endpoint", ch)
client := &http.Client{
Transport: &http.Transport{
DisableCompression: true,
},
}
req, _ := http.NewRequest(http.MethodGet, server.URL+"/foo_endpoint", nil)
req.Header.Set(acceptEncodingHeader, deflateEncoding)
resp, err := client.Do(req)
require.NoError(t, err, "client get failed with unexpected error")
defer resp.Body.Close()
actualHeader := resp.Header.Get(contentEncodingHeader)
require.Equal(t, deflateEncoding, actualHeader, "expected response with encoding header")
var buf bytes.Buffer
dr, err := zlib.NewReader(resp.Body)
require.NoError(t, err, "unexpected error while creating the response body reader")
_, err = buf.ReadFrom(dr)
require.NoError(t, err, "unexpected error while reading the response body")
actual := buf.String()
expected := "Hello World!"
require.Equal(t, expected, actual, "expected response with content")
}
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