HttpException.this

this

(string msg,  string file =  __FILE__,  size_t line =  __LINE__,
          Throwable next =  null)

Constructs an HTTP exception.

Params follow the Phobos convention (msg, file, line, next), matching TlsException.

`msg`	Human readable message.
`file`	Source file where the exception was thrown.
`line`	Source line where the exception was thrown.
`next`	Optional chained exception.