Find the bug.
The php script first reads the target site with a get request and retrieves the _VIEWSTATE and a couple other variables.
Next the script does a post request that matches the post request from my browser ( or at least almost matches ) in order to advance the calendar.
The post response should be the next month's calendar but it is a redirect page due to my bug.
The post body can be replicated by removing the comment on the 2nd ajaxUrl line.
I haven't addressed cookies because the calendar advances when cookies are turned off. I also haven't sequenced the post variables to match the sequence in the raw post request.
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5 freelance font une offre moyenne de $101 pour ce travail
I have expertise both in PHP and ASP.NET. I can find out the issue and make it working as expected. If you award me the project I'll start working.