The current documentation is as follows. Are there any other options?
HTTP POST Request Access a URL using HTTP POST and save the result into a file. The allowed properties in the <httppost> action are: • <filename>: Filename to which to save the result to • <password>: Password for URLs that require authentication • <url>: URL to launch • <username>: Username for URLs that require authentication • <queryparameterlist>: List of variables that will be included in the POST query.
asked 06 Jun '13, 14:02
Unfortunately it is not possible to specify additional headers for a HTTP Post call.
Could you provide us with more details about which fields do you need to support?
answered 07 Jun '13, 10:16