• Add 429 error message page

    From Rob Swindell@VERT to GitLab note in main/sbbs on Thursday, April 24, 2025 12:43:40
    https://gitlab.synchro.net/main/sbbs/-/merge_requests/534#note_7132

    This issue that triggers the web server to return error 429 is actually when the maximum concurrent connections limit is exceeded. It doesn't have anything to do with "period of time".

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