[JENKINS-76080] webhook response:  HTTP ERROR 400 No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility).

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<title>Error 400 No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility).</title>

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<body><h2>HTTP ERROR 400 No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility).</h2>

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<tr><th>URI:</th><td>/github-webhook/</td></tr>

<tr><th>STATUS:</th><td>400</td></tr>

<tr><th>MESSAGE:</th><td>No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility).</td></tr>

<tr><th>SERVLET:</th><td>Stapler</td></tr>

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<details><summary>Originally reported by <a href="https://issues.jenkins.io/secure/ViewProfile.jspa?name=claus_lee">claus_lee</a>, imported from: <a class="original-jira-link" href="https://issues.jenkins.io/browse/JENKINS-76080" target="_blank">webhook response: HTTP ERROR 400 No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility).</a></summary>
<ul>
<li>assignee: <img align="left" width="20" src="https://raw.githubusercontent.com/jenkinsci/artifacts-from-jira-issues/refs/heads/main/avatars/lanwen.png" title="lanwen's avatar" /> <a href="https://issues.jenkins.io/secure/ViewProfile.jspa?name=lanwen">lanwen</a>
<li>status: Open
<li>priority: Minor
<li>component(s): github-plugin
<li>resolution: Unresolved
<li>votes: 1
<li>watchers: 6
<li>imported: 2025-12-08
</ul>
<details><summary>Raw content of original issue</summary>

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&lt;meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1"/&gt;

&lt;title&gt;Error 400 No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility).&lt;/title&gt;

&lt;/head&gt;

&lt;body&gt;&lt;h2&gt;HTTP ERROR 400 No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility).&lt;/h2&gt;

&lt;table&gt;

&lt;tr&gt;&lt;th&gt;URI:&lt;/th&gt;&lt;td&gt;/github-webhook/&lt;/td&gt;&lt;/tr&gt;

&lt;tr&gt;&lt;th&gt;STATUS:&lt;/th&gt;&lt;td&gt;400&lt;/td&gt;&lt;/tr&gt;

&lt;tr&gt;&lt;th&gt;MESSAGE:&lt;/th&gt;&lt;td&gt;No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility).&lt;/td&gt;&lt;/tr&gt;

&lt;tr&gt;&lt;th&gt;SERVLET:&lt;/th&gt;&lt;td&gt;Stapler&lt;/td&gt;&lt;/tr&gt;

&lt;/table&gt;

&lt;hr/&gt;&lt;a href="https://jetty.org/"&gt;Powered by Jetty:// 12.0.22&lt;/a&gt;&lt;hr/&gt;

 

&lt;/body&gt;

&lt;/html&gt;</pre>
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</details>
<details><summary>1 attachment</summary>

- [Screenshot 2025-09-12 at 11.13.51 PM.png](https://issues.jenkins.io/secure/attachment/64887/Screenshot%202025-09-12%20at%2011.13.51%26%238239%3BPM.png)
 > ![Screenshot 2025-09-12 at 11.13.51 PM.png](https://issues.jenkins.io/secure/attachment/64887/Screenshot%202025-09-12%20at%2011.13.51%26%238239%3BPM.png)
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[JENKINS-76080] webhook response: HTTP ERROR 400 No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility). #774

HTTP ERROR 400 No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility).

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URI:	/github-webhook/
STATUS:	400
MESSAGE:	No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility).
SERVLET:	Stapler

Uh oh!

[JENKINS-76080] webhook response: HTTP ERROR 400 No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility). #774

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HTTP ERROR 400 No valid signature found. Ensure webhook is configured with a supported signature algorithm (SHA-256 recommended, SHA-1 for legacy compatibility).

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