Unable to get POST data from app/json request

[HaseProgram]

Hi! I Got issue when there is no way to get data with content-type app/json (while urlencoded form works fine) I tried both of methods (in source code they looks similar):

email := c.PostForm("email")
email := c.Form("email")

Also tried context.Read() like it was shown in README but with no result - also empty response. Here is the example of my request:

POST http://localhost:8080/api/user/username/create HTTP/1.1
Accept: application/json
Content-Type: application/json
{
  "about": "About me.",
  "email": "hello@mail.com",
  "fullname": "John Smith"
}

All of theese fields are empty in c *routing.Context. Can you help me and show me what I'm doing wrong? Thanks in advice!