add UseFullPath option to use full path when true

proxy_route.go

@@ -50,6 +50,9 @@ type ProxyRoute struct {
 	MiddlewareParams interface{} `json:"middleware_params" yaml:"middleware_params"`
 	// Set to true to see errors on web page when there is a panic error on gobis
 	ShowError bool `json:"show_error" yaml:"show_error"`
+	// Set to true to use full path
+	// e.g.: path=/metrics/** and request=/metrics/foo this will be redirected to /metrics/foo on upstream instead of /foo
+	UseFullPath bool `json:"use_full_path" yaml:"use_full_path"`
 	// Chain others routes in a routes
 	Routes []ProxyRoute `json:"routes" yaml:"routes"`
 	// Set an handler to use to forward request to this handler when using gobis programmatically
@@ -139,22 +142,28 @@ func (r ProxyRoute) RequestPath(req *http.Request) string {
 }
 
 func (r ProxyRoute) UpstreamUrl(req *http.Request) *url.URL {
+	origPath := ""
+	if r.UseFullPath {
+		origPath = r.PathAsStartPath() + "/"
+	}
 	if r.ForwardHandler != nil {
-		req.URL.Path = ""
+		req.URL.Path = origPath
 		return req.URL
 	}
 	var upstreamUrl *url.URL
 	if r.ForwardedHeader == "" {
 		upstreamUrl, _ = url.Parse(r.Url)
+		upstreamUrl.Path = origPath + upstreamUrl.Path
 		return upstreamUrl
 	}
 	upstream := req.Header.Get(r.ForwardedHeader)
 	if upstream == "" {
 		upstreamUrl, _ = url.Parse(r.Url)
+		upstreamUrl.Path = origPath + upstreamUrl.Path
 		return upstreamUrl
 	}
 	upstreamUrl, _ = url.Parse(upstream)
-	upstreamUrl.Path = ""
+	upstreamUrl.Path = origPath
 	return upstreamUrl
 }
 

router_factory_test.go

@@ -50,6 +50,16 @@ var _ = Describe("RouterFactory", func() {
 				Expect(request.Header.Get("Authorization")).ShouldNot(BeEmpty())
 			})
 		})
+		Context("when route have option UseFullPath", func() {
+			It("should set request url with start path from path option", func() {
+				ForwardRequest(ProxyRoute{
+					Path:        NewPathMatcher("/root"),
+					Url:         "http://my.proxified.api",
+					UseFullPath: true,
+				}, request, "")
+				Expect(request.URL.String()).Should(Equal("http://my.proxified.api/root"))
+			})
+		})
 		Context("when route have option ForwardedHeader", func() {
 			It("should set request url to upstream url", func() {
 				req, _ := http.NewRequest("GET", "http://localhost/path", nil)