Merge pull request #14697 from vishh/api-proxy

Avoid rewriting URLs in the proxy, if the application is proxy-aware.

pkg/util/proxy/transport.go

@@ -136,8 +136,11 @@ func (t *Transport) rewriteURL(targetURL string, sourceURL *url.URL) string {
 	url.Scheme = t.Scheme
 	url.Host = t.Host
 	origPath := url.Path
+	// Do not rewrite URL if the sourceURL already contains the necessary prefix.
+	if strings.HasPrefix(url.Path, t.PathPrepend) {
+		return url.String()
+	}
 	url.Path = path.Join(t.PathPrepend, url.Path)
-
 	if strings.HasSuffix(origPath, "/") {
 		// Add back the trailing slash, which was stripped by path.Join().
 		url.Path += "/"

pkg/util/proxy/transport_test.go

@@ -150,6 +150,14 @@ func TestProxyTransport(t *testing.T) {
 			redirectWant: "http://example.com/redirected/target/",
 			forwardedURI: "/proxy/minion/minion1:10250/redirect",
 		},
+		"source contains the redirect already": {
+			input:        `<pre><a href="kubelet.log">kubelet.log</a><a href="http://foo.com/proxy/minion/minion1:10250/google.log">google.log</a></pre>`,
+			sourceURL:    "http://foo.com/logs/log.log",
+			transport:    testTransport,
+			output:       `<pre><a href="kubelet.log">kubelet.log</a><a href="http://foo.com/proxy/minion/minion1:10250/google.log">google.log</a></pre>`,
+			contentType:  "text/html",
+			forwardedURI: "/proxy/minion/minion1:10250/logs/log.log",
+		},
 	}
 
 	testItem := func(name string, item *Item) {