即使httpCon.setRequestMethod（" GET"），HttpURLConnection也会发送POST请求;已设定 [英] HttpURLConnection sends a POST request even though httpCon.setRequestMethod("GET"); is set

问题描述

这是我的代码：

String addr = "http://172.26.41.18:8080/domain/list";

URL url = new URL(addr);
HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
httpCon.setDoOutput(true);
httpCon.setDoInput(true);
httpCon.setUseCaches(false);
httpCon.setAllowUserInteraction(false);
httpCon.setRequestMethod("GET");
httpCon.addRequestProperty("Authorization", "Basic YWRtaW4fYFgjkl5463");

httpCon.connect();

OutputStreamWriter out = new OutputStreamWriter(httpCon.getOutputStream());

System.out.println(httpCon.getResponseCode());
System.out.println(httpCon.getResponseMessage());

out.close();

我在回复中看到的内容：

What I see in response:

500服务器错误

500 Server error

我打开 httpCon var，以及我看到的内容：

I open my httpCon var, and what I see:

POST / rest / platform / domain / list HTTP / 1.1

POST /rest/platform/domain/list HTTP/1.1

为什么它设置为POST，即使我使用 httpCon.setRequestMethod（GET）; 来设置它GET？

Why is it set to POST even though I have used httpCon.setRequestMethod("GET"); to set it to GET?

推荐答案

httpCon.setDoOutput（true）; 含蓄地将请求方法设置为POST，因为只要您想发送请求正文，这就是默认方法。

The httpCon.setDoOutput(true); implicitly set the request method to POST because that's the default method whenever you want to send a request body.

如果要使用GET，请删除该行并删除 OutputStreamWriter out = new OutputStreamWriter（httpCon.getOutputStream（））; line。您无需为GET请求发送请求正文。

If you want to use GET, remove that line and remove the OutputStreamWriter out = new OutputStreamWriter(httpCon.getOutputStream()); line. You don't need to send a request body for GET requests.

以下内容适用于简单的GET请求：

The following should do for a simple GET request:

String addr = "http://172.26.41.18:8080/domain/list";
URL url = new URL(addr);
HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
httpCon.setUseCaches(false);
httpCon.setAllowUserInteraction(false);
httpCon.addRequestProperty("Authorization", "Basic YWRtaW4fYFgjkl5463");
System.out.println(httpCon.getResponseCode());
System.out.println(httpCon.getResponseMessage());

参见：

• 使用java.net .URLConnection以触发和处理HTTP请求



See also:

• Using java.net.URLConnection to fire and handle HTTP requests

不相关对于具体问题，授权标头值的密码部分似乎没有正确地进行Base64编码。也许它是乱码的，因为它是示例性的，但即使它不是我修复你的Base64编码方法。

Unrelated to the concrete problem, the password part of your Authorization header value doesn't seem to be properly Base64-encoded. Perhaps it's scrambled because it was examplary, but even if it wasn't I'd fix your Base64 encoding approach.

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