Java：在发送之前显示HttpURLConnection的请求 [英] Java: Display request of an HttpURLConnection before sending

问题描述

我想使用 HttpURLConnection 对服务器进行一些API调用。但请求不成功，返回：

I want to make some API calls to a server using HttpURLConnection. But the requests are not successful, returning:

<error>
  <http_status>400 Bad Request</http_status>
  <message>Unexpected request Content-Type header ''. Expecting 'application/x-www-form-urlencoded'.</message>
</error>

所以我想查看发送到服务器的真实内容。根据实际内容，我的意思是确切的HTTP请求。

So I want to check what the "real" content is that is being sent to the server. By real content I mean the exact HTTP request.

我有什么想法可以看到这个？

Any ideas how I can see this?

编辑：
基于这里的第一个答案我应该澄清我的问题：我想避免使用像HTTP嗅探器或任何东西的外部程序，我希望有一个功能或属性或其他什么保存我正在寻找的信息。

Based on the first answers here I should clarify my problem: I want to avoid using an external program like HTTP sniffer or anything and I was hoping that there is a function or a property or whatever that holds the information I am looking for.

如果不是这样，有人知道是否可以手动重建这些信息（例如通过调用getRequestMethod等几个函数（）等。）

If that is not the case, does someone know if this information can be manually rebuilt (for example by calling several functions like getRequestMethod(), etc.)

我经常遇到这个问题，所以我自己努力建立这样的功能。只需知道如何：）

I am facing this problem kinda often so that it's worth the effort to build such functionality myself. Just need to know how :)

推荐答案

您可以通过启用带有

-Djava.util.logging.config.file=logging.properties

并放入logging.properties（默认情况下在JRE_HOME \lib中）以下属性

and put in logging.properties (by default in JRE_HOME\lib) the following property

sun.net.www.protocol.http.HttpURLConnection.level = ALL

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