[JENKINS-15244] Gerrit Trigger - 405 Method not allowed when a build is launched manually

Hello,

When I use the "trick" to add a string parameter called "GERRIT_REFSPEC" with "refs/heads/master" as default value (described here: https://wiki.jenkins-ci.org/display/JENKINS/Gerrit+Trigger), I can't click on the "Launch a build" button.

I get this error: "Method not allowed: The requested method GET is not allowed for the URL /job/HelloWorld/build". This does not happen if the parameter is not set (even if the build fails, which is only logical).

Thank you for your help

---
Originally reported by theo_c, imported from: Gerrit Trigger - 405 Method not allowed when a build is launched manually

• status: Open
  
• priority: Minor
  
• component(s): gerrit-trigger-plugin, git-plugin, OBSOLETE-gerrit-plugin
  
• label(s): gerrit, gitplugin
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 2
  
• imported: 2025-12-02
  

Hello,


When I use the "trick" to add a string parameter called "GERRIT_REFSPEC" with "refs/heads/master" as default value (described here: https://wiki.jenkins-ci.org/display/JENKINS/Gerrit+Trigger), I can't click on the "Launch a build" button.


I get this error: "Method not allowed: The requested method GET is not allowed for the URL /job/HelloWorld/build". This does not happen if the parameter is not set (even if the build fails, which is only logical).


Thank you for your help

environment

```
Jenkins 1.466.1 and Gerrit 2.4.2 on Ubuntu 12.04

Gerrit Trigger 2.6.0, Git Plugin 1.1.23
```