[docs] [issue12524] change httplib docs POST example

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

You'll need a page that accepts POST requests, possibly returning some meaningful value, and without side effects (e.g. adding messages is usually done via POST, but we don't want a new message for every user that tries the example).

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nosy: +ezio.melotti

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