Mockbin能够让你生成 custom endpoints 来模拟，测试和跟踪HTTP请求和响应。 

OkHttpClient client = new OkHttpClient();    MediaType mediaType = MediaType.parse("application/json");  RequestBody body = RequestBody.create(mediaType, "{\"foo\": \"bar\"}");  Request request = new Request.Builder()    .url("http://mockbin.com/request?foo=bar&foo=baz")    .post(body)    .addHeader("cookie", "foo=bar; bar=baz")    .addHeader("accept", "application/json")    .addHeader("content-type", "application/json")    .addHeader("x-pretty-print", "2")    .build();    Response response = client.newCall(request).execute();

特性

• 使用HAR 格式
• 支持JSON, YAML, XML, HTML output
• plays nice with proxies (uses the X-Forwarded-* headers for IP resolution)
• allows for HTTP Method Override using the headerX-HTTP-Method-Overrideor through query string parameter:_method
• create custom bins for experimenting log collection

项目主页：http://www.open-open.com/lib/view/home/1428545348697