ntome authored Oct 11, 2017 and Romain Bignon committed Nov 18, 2017

The do_login cleared all headers, including User-Agent, but the site
spits 500s when this header is missing.

Also, 'application/json' was set for all requests, even GET requests and
form POSTs. Set it only for requests posting json.

PEA accounts are parsed the same way as MARKET accounts.