Fix basic auth handler

httpbin/handlers.go

@@ -301,6 +301,7 @@ func (h *HTTPBin) BasicAuth(w http.ResponseWriter, r *http.Request) {
 	authorized := givenUser == expectedUser && givenPass == expectedPass
 	if !authorized {
 		status = http.StatusUnauthorized
+		w.Header().Set("WWW-Authenticate", `Basic realm="Fake Realm"`)
 	}
 
 	body, _ := json.Marshal(&authResponse{

httpbin/handlers_test.go

@@ -938,6 +938,7 @@ func TestBasicAuth(t *testing.T) {
 
 		assertStatusCode(t, w, http.StatusUnauthorized)
 		assertContentType(t, w, jsonContentType)
+		assertHeader(t, w, "WWW-Authenticate", `Basic realm="Fake Realm"`)
 
 		resp := &authResponse{}
 		json.Unmarshal(w.Body.Bytes(), resp)
@@ -959,6 +960,7 @@ func TestBasicAuth(t *testing.T) {
 
 		assertStatusCode(t, w, http.StatusUnauthorized)
 		assertContentType(t, w, jsonContentType)
+		assertHeader(t, w, "WWW-Authenticate", `Basic realm="Fake Realm"`)
 
 		resp := &authResponse{}
 		json.Unmarshal(w.Body.Bytes(), resp)