example_test.go

Documentation: net/http/httputil

		 1  // Copyright 2015 The Go Authors. All rights reserved.
		 2  // Use of this source code is governed by a BSD-style
		 3  // license that can be found in the LICENSE file.
		 4  
		 5  package httputil_test
		 6  
		 7  import (
		 8  	"fmt"
		 9  	"io"
		10  	"log"
		11  	"net/http"
		12  	"net/http/httptest"
		13  	"net/http/httputil"
		14  	"net/url"
		15  	"strings"
		16  )
		17  
		18  func ExampleDumpRequest() {
		19  	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		20  		dump, err := httputil.DumpRequest(r, true)
		21  		if err != nil {
		22  			http.Error(w, fmt.Sprint(err), http.StatusInternalServerError)
		23  			return
		24  		}
		25  
		26  		fmt.Fprintf(w, "%q", dump)
		27  	}))
		28  	defer ts.Close()
		29  
		30  	const body = "Go is a general-purpose language designed with systems programming in mind."
		31  	req, err := http.NewRequest("POST", ts.URL, strings.NewReader(body))
		32  	if err != nil {
		33  		log.Fatal(err)
		34  	}
		35  	req.Host = "www.example.org"
		36  	resp, err := http.DefaultClient.Do(req)
		37  	if err != nil {
		38  		log.Fatal(err)
		39  	}
		40  	defer resp.Body.Close()
		41  
		42  	b, err := io.ReadAll(resp.Body)
		43  	if err != nil {
		44  		log.Fatal(err)
		45  	}
		46  
		47  	fmt.Printf("%s", b)
		48  
		49  	// Output:
		50  	// "POST / HTTP/1.1\r\nHost: www.example.org\r\nAccept-Encoding: gzip\r\nContent-Length: 75\r\nUser-Agent: Go-http-client/1.1\r\n\r\nGo is a general-purpose language designed with systems programming in mind."
		51  }
		52  
		53  func ExampleDumpRequestOut() {
		54  	const body = "Go is a general-purpose language designed with systems programming in mind."
		55  	req, err := http.NewRequest("PUT", "http://www.example.org", strings.NewReader(body))
		56  	if err != nil {
		57  		log.Fatal(err)
		58  	}
		59  
		60  	dump, err := httputil.DumpRequestOut(req, true)
		61  	if err != nil {
		62  		log.Fatal(err)
		63  	}
		64  
		65  	fmt.Printf("%q", dump)
		66  
		67  	// Output:
		68  	// "PUT / HTTP/1.1\r\nHost: www.example.org\r\nUser-Agent: Go-http-client/1.1\r\nContent-Length: 75\r\nAccept-Encoding: gzip\r\n\r\nGo is a general-purpose language designed with systems programming in mind."
		69  }
		70  
		71  func ExampleDumpResponse() {
		72  	const body = "Go is a general-purpose language designed with systems programming in mind."
		73  	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		74  		w.Header().Set("Date", "Wed, 19 Jul 1972 19:00:00 GMT")
		75  		fmt.Fprintln(w, body)
		76  	}))
		77  	defer ts.Close()
		78  
		79  	resp, err := http.Get(ts.URL)
		80  	if err != nil {
		81  		log.Fatal(err)
		82  	}
		83  	defer resp.Body.Close()
		84  
		85  	dump, err := httputil.DumpResponse(resp, true)
		86  	if err != nil {
		87  		log.Fatal(err)
		88  	}
		89  
		90  	fmt.Printf("%q", dump)
		91  
		92  	// Output:
		93  	// "HTTP/1.1 200 OK\r\nContent-Length: 76\r\nContent-Type: text/plain; charset=utf-8\r\nDate: Wed, 19 Jul 1972 19:00:00 GMT\r\n\r\nGo is a general-purpose language designed with systems programming in mind.\n"
		94  }
		95  
		96  func ExampleReverseProxy() {
		97  	backendServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		98  		fmt.Fprintln(w, "this call was relayed by the reverse proxy")
		99  	}))
	 100  	defer backendServer.Close()
	 101  
	 102  	rpURL, err := url.Parse(backendServer.URL)
	 103  	if err != nil {
	 104  		log.Fatal(err)
	 105  	}
	 106  	frontendProxy := httptest.NewServer(httputil.NewSingleHostReverseProxy(rpURL))
	 107  	defer frontendProxy.Close()
	 108  
	 109  	resp, err := http.Get(frontendProxy.URL)
	 110  	if err != nil {
	 111  		log.Fatal(err)
	 112  	}
	 113  
	 114  	b, err := io.ReadAll(resp.Body)
	 115  	if err != nil {
	 116  		log.Fatal(err)
	 117  	}
	 118  
	 119  	fmt.Printf("%s", b)
	 120  
	 121  	// Output:
	 122  	// this call was relayed by the reverse proxy
	 123  }
	 124
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