Strange behaviour of the POST service (BB-8245)

Some things I noticed about the POST service that I considere bugs:

• Actual POST data is in the format
  {{{
  #!python
  payload=%7B%22repository%22%3A+%7B%22website%22%3A+%22%22%2C+%22fork%22%3A+false...
  }}}
  what has two issues:
  a) the client has to strip off the "payload=" part of the message
  b) the actual content is URL encoded what makes no sense for POST data
• The triggered message from the POST service will be sent twice to the client (one duplicate after around 20 seconds), see screenshots!

I hope you can resolve this issues because I have build a small update server for my live system that relies on the POST service.

Kind regards