Error 405

The complete error message, from reading a number of threads in Google Blogger Help, appears to be

HTTP method POST is not supported by this URL Error 405

What is the meaning of this message? Is this a peer error to the old friend (not)

We're sorry, but we were unable to complete your request.

Here's a sampling of reports. Some threads suffer from subject drift, some involve Blogger Employee, some may have just died. Who knows? I don't see it listed in Beta Known Issues, but it seems to come and go.

• Convert to Layout Started 9/24
  
• Can not access Blog Beta from cousin Started 9/18
  
• "We're sorry, but we were unable..."... Started 8/27 Massive thread drift, AND a celebrity appearance by Blogger Employee.
  
• BLOGGER BETA Started 8/16
  
• Blogger Beta Invite-Only Redirection Failed Started 8/15
  

If I omitted to list your favourite thread, please accept my apologies, and please let me know.