How to set a project git default production branch using REST API

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Hi!

I’m trying to create a project using REST API with Gitlab configuration and a specific production branch (e.g. main instead of master). I struggle to achieve that using just a single request.

For instance, if a do:

POST/projects

with body:

{
  "name": "myprojectname",
  "git_remote_url": "https://gitlab.com/myuser/myproject.git",
  "git_username": "myuser",
  "git_password": "glpat-mytoken",
  "git_production_branch_name": "main",
  "git_service_name": "gitlab"
}

I get:

POST /projects (500: Internal Server Error)
Body (40 bytes)
{
  "error": "Uh oh! Something went wrong."
}

If I use the same body but without specifying git_production_branch_name it works, but it creates a new repository branch named master.

After that, I can update the project using:

PATCH/projects/{project_id}

with body:

{
  "git_production_branch_name": "main"
}

And it works, but then I have to remove master branch…

¿Is there a way to achive that using a single request or, at least, without creating a new master branch?

I can’t see this limitation in documentation…

Thanks for help!

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