feat: add /dump/request endpoint (#109)

Author: chinaran

httpbin/handlers.go

@@ -7,6 +7,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"net/http/httputil"
 	"net/url"
 	"sort"
 	"strconv"
@@ -1013,6 +1014,20 @@ func (h *HTTPBin) Base64(w http.ResponseWriter, r *http.Request) {
 	writeResponse(w, http.StatusOK, "text/plain", result)
 }
 
+// DumpRequest - returns the given request in its HTTP/1.x wire representation.
+// The returned representation is an approximation only;
+// some details of the initial request are lost while parsing it into
+// an http.Request. In particular, the order and case of header field
+// names are lost.
+func (h *HTTPBin) DumpRequest(w http.ResponseWriter, r *http.Request) {
+	dump, err := httputil.DumpRequest(r, true)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Write(dump)
+}
+
 // JSON - returns a sample json
 func (h *HTTPBin) JSON(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", jsonContentType)

httpbin/handlers_test.go

@@ -2840,6 +2840,19 @@ func TestBase64(t *testing.T) {
 	}
 }
 
+func TestDumpRequest(t *testing.T) {
+	t.Parallel()
+	r, _ := http.NewRequest("GET", "/dump/request?foo=bar", nil)
+	r.Host = "test-host"
+	r.Header.Set("x-test-header2", "Test-Value2")
+	r.Header.Set("x-test-header1", "Test-Value1")
+	w := httptest.NewRecorder()
+	app.ServeHTTP(w, r)
+
+	assertContentType(t, w, "text/plain; charset=utf-8")
+	assertBodyEquals(t, w, "GET /dump/request?foo=bar HTTP/1.1\r\nHost: test-host\r\nX-Test-Header1: Test-Value1\r\nX-Test-Header2: Test-Value2\r\n\r\n")
+}
+
 func TestJSON(t *testing.T) {
 	t.Parallel()
 	r, _ := http.NewRequest("GET", "/json", nil)

httpbin/httpbin.go

@@ -145,6 +145,8 @@ func (h *HTTPBin) Handler() http.Handler {
 	mux.HandleFunc("/uuid", h.UUID)
 	mux.HandleFunc("/base64/", h.Base64)
 
+	mux.HandleFunc("/dump/request", h.DumpRequest)
+
 	// existing httpbin endpoints that we do not support
 	mux.HandleFunc("/brotli", notImplementedHandler)