handle100Continue parameter is missing in documentation

[MogDeChNord]

Hello,

We faced an issue while trying to call an endpoint while passing through a proxy that adds the "Expect 100-continue" header.
The gateway did not answer "100" so the whole call falls in timeout.

While crawling the code we found here that a variable is supposed to handle that:

this.handle100Continue(environment.getProperty(prefix + ".handle100Continue", Boolean.class, FAULT_HANDLE_100_CONTINUE));

but by default set to false.

Fixed by setting the config:

http:
  handle100Continue: true

This parameter is not described in the documentation or maybe somewhere else.