对Jenkins的纯Java REST API POST调用/reload或/restart始终返回禁止状态403，但可以工作 [英] Pure Java REST API POST calls to Jenkins /reload or /restart always return status 403 forbidden, but work

问题描述

运行此命令时出现异常，但是 Jenkins实际上执行了请求的操作:

I'm getting an Exception when running this, but Jenkins actually executes the requested action:

  URL url = new URL("https://somehost.com/jenkins/quietDown");
  HttpURLConnection c= (HttpURLConnection) url.openConnection();
  c.setRequestMethod("POST");
  c.setRequestProperty("Authorization", "Basic " + Base64.getEncoder().encodeToString(("user:apiToken").getBytes()));
  c.getInputStream().close();

例外:

Exception in thread "main" java.io.IOException: Server returned HTTP response code: 403 for URL: https://somehost.com/jenkins/
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1894)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:263)
    at build.JenkinsClient.main(JenkinsClient.java:102)

使用Jenkins 2.164.3和Java 8进行测试.

Testing with Jenkins 2.164.3 and Java 8.

推荐答案

设置此设置可消除异常:

Setting this gets rid of the Exception:

connection.setInstanceFollowRedirects(false);

几个小时后，我注意到堆栈跟踪包含的URL与我发布到的URL略有不同:

After hours I noticed how the stack trace contained a slightly different URL than the one I was posting to:

https://somehost.com/jenkins/
vs
https://somehost.com/jenkins/quietDown

Jenkins似乎用重定向(302 Found)回答，默认情况下，HttUrlConnections会从该重定向中读取该重定向(302 Found)，然后由于某种原因导致该异常.

It seems like Jenkins answers with a redirect (302 Found), which the HttUrlConnections follows by default to read from, which then for some reason caused that exception.

在最长的时间内，我试图找到一种不调用connection.getInputStream()即可发出POST请求的方法，但这似乎是唯一实际触发请求的调用.如果有人知道使用纯Java发出POST请求的另一种方法，请告诉我.

For the longest time, I tried to figure out a way to issue the POST request without calling connection.getInputStream(), but that seems to be the only call which actually triggers the request. If anyone knows a different way to issue a POST request with pure Java, please let me know.

我知道我的URL和username:token内容是正确的，因为我使用curl进行了测试(即使打开了Follow redirect选项，它也没有抱怨):

I knew my URL and username:token stuff was correct because I tested with curl (which doesn't complain, even with the follow redirect option turned on):

curl -X POST https://somehost.com/jenkins/quietDown -u admin:token
curl -L -X POST https://somehost.com/jenkins/quietDown -u admin:token

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