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Summary:
Configure an NSURLSession with an NSURLSessionConfiguration that has an explicit HTTPAdditionalHeaders property that specifies a Content-type of application/json. Use that session to produce a data task, then subsequently resume that task so the HTTP request is made. The request will be made with a Content-type of application/x-www-form-urlencoded, and the HTTPBody will also be form-encoded.

Steps to Reproduce:
The following steps are relative to the ViewController.m file in the sample project.

1. Configure a default NSURLSessionConfiguration (line 20)
2. Specify HTTPAdditionalHeaders with a Content-type of application/json (line 21)
3. Create an NSMutableURLRequest (line 34)
4. Specify POST as the HTTPMethod (line 35)
5. Specify an HTTPBody  that contains JSON data (line 36)
6. Create a data task with the request (line 38)
7. Resume the task (line 46)

Expected Results:
I expected the request to be POSTed with a Content-type header of application/json and the HTTPBody to not be form encoded.

Actual Results:
The request was POSTed as application/x-www-form-urlencoded and the HTTPBody was form encoded. I know this because I ran the device through mitmproxy. It produced the following request:

2015-04-09 16:36:17 POST http://www.example.com/

Host:              www.example.com
Content-Type:      application/x-www-form-urlencoded
Connection:        keep-alive
Proxy-Connection:  keep-alive
Accept:            */*
User-Agent:        HTTPContentType/1 CFNetwork/711.3.18 Darwin/14.0.0
Accept-Language:   en-us
Content-Length:    120
Accept-Encoding:   gzip, deflate
URLEncoded form
{                               
  "quote" : "Once an SDK has    
been expanded by a code         
modification, it will never     
return to its original          
dimensions."                    
}:           





Version:
iOS 8.3 (12F70)

Notes:
The iOS 8.3 documentation for NSURLSessionConfiguration.HTTPAdditionalHeaders does not indicate that the Content-type header should be avoided. This worked in previous versions of iOS.

Configuration:
iPhone 6+ 64 GB

Attachments:
'HTTPContentType.zip' was successfully uploaded.