Merge pull request #31 from Mikulas/pr/health

Add /health endpoint

README.md

@@ -218,6 +218,10 @@ You can find helpful code snippets in the `examples` folder.
 
 imgproxy supports only the most popular image formats of the moment: PNG, JPEG, GIF and WebP.
 
+## Deployment
+
+There is a special endpoint `/health`, which returns HTTP Status `200 OK` after server successfully starts. This can be used to check container readiness.   
+
 ## Author
 
 Sergey "DarthSim" Aleksandrovich

server.go

@@ -175,6 +175,12 @@ func (h *httpHandler) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 		panic(invalidSecretErr)
 	}
 
+	if r.URL.Path == "/health" {
+		rw.WriteHeader(200);
+		rw.Write([]byte("imgproxy is running"));
+		return
+	}
+
 	imgURL, procOpt, err := parsePath(r)
 	if err != nil {
 		panic(newError(404, err.Error(), "Invalid image url"))