output json status based on 'Accept' header

...instead if having a separate URL.

Closes #1063.

prog/weaver/main.go

@@ -259,6 +259,11 @@ func handleHTTP(router *weave.Router, httpAddr string, allocator *ipam.Allocator
 		allocator.HandleHTTP(muxRouter, defaultSubnet, docker)
 	}
 
+	muxRouter.Methods("GET").Path("/status").Headers("Accept", "application/json").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		json, _ := router.StatusJSON(version)
+		w.Write(json)
+	})
+
 	muxRouter.Methods("GET").Path("/status").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		fmt.Fprintln(w, "weave router", version)
 		fmt.Fprintln(w, router.Status())
@@ -268,11 +273,6 @@ func handleHTTP(router *weave.Router, httpAddr string, allocator *ipam.Allocator
 		}
 	})
 
-	muxRouter.Methods("GET").Path("/status-json").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		json, _ := router.StatusJSON(version)
-		w.Write(json)
-	})
-
 	muxRouter.Methods("POST").Path("/connect").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if err := r.ParseForm(); err != nil {
 			http.Error(w, fmt.Sprint("unable to parse form: ", err), http.StatusBadRequest)