Add explicit /head handler

httpbin/handlers_test.go

@@ -216,11 +216,31 @@ func TestGet(t *testing.T) {
 }
 
 func TestHEAD(t *testing.T) {
-	r, _ := http.NewRequest("HEAD", "/", nil)
+	testCases := []struct {
+		verb     string
+		path     string
+		wantCode int
+	}{
+		{"HEAD", "/", http.StatusOK},
+		{"HEAD", "/get", http.StatusOK},
+		{"HEAD", "/head", http.StatusOK},
+		{"HEAD", "/post", http.StatusMethodNotAllowed},
+		{"GET", "/head", http.StatusMethodNotAllowed},
+	}
+	for _, tc := range testCases {
+		t.Run(fmt.Sprintf("%s %s", tc.verb, tc.path), func(t *testing.T) {
+			r, _ := http.NewRequest(tc.verb, tc.path, nil)
 			w := httptest.NewRecorder()
 			handler.ServeHTTP(w, r)
 
-	assertStatusCode(t, w, 200)
+			assertStatusCode(t, w, tc.wantCode)
+
+			// we only do further validation when we get an OK response
+			if tc.wantCode != http.StatusOK {
+				return
+			}
+
+			assertStatusCode(t, w, http.StatusOK)
 			assertBodyEquals(t, w, "")
 
 			contentLengthStr := w.Header().Get("Content-Length")
@@ -234,6 +254,9 @@ func TestHEAD(t *testing.T) {
 			if contentLength <= 0 {
 				t.Fatalf("Content-Lengh %v should be greater than 0", contentLengthStr)
 			}
+		})
+	}
+
 }
 
 func TestCORS(t *testing.T) {

httpbin/httpbin.go

@@ -124,11 +124,12 @@ func (h *HTTPBin) Handler() http.Handler {
 	mux.HandleFunc("/forms/post", methods(h.FormsPost, "GET"))
 	mux.HandleFunc("/encoding/utf8", methods(h.UTF8, "GET"))
 
+	mux.HandleFunc("/delete", methods(h.RequestWithBody, "DELETE"))
 	mux.HandleFunc("/get", methods(h.Get, "GET"))
+	mux.HandleFunc("/head", methods(h.Get, "HEAD"))
+	mux.HandleFunc("/patch", methods(h.RequestWithBody, "PATCH"))
 	mux.HandleFunc("/post", methods(h.RequestWithBody, "POST"))
 	mux.HandleFunc("/put", methods(h.RequestWithBody, "PUT"))
-	mux.HandleFunc("/patch", methods(h.RequestWithBody, "PATCH"))
-	mux.HandleFunc("/delete", methods(h.RequestWithBody, "DELETE"))
 
 	mux.HandleFunc("/ip", h.IP)
 	mux.HandleFunc("/user-agent", h.UserAgent)