Beego: Cannot return JSON with non-200 status code

[natemara]

When the status code is explicitly set, the Content-Type header is automatically change to text/plain. I would like the ability to send back JSON data for API consistency.

func (u *UserController) Post() {
    u.Ctx.ResponseWriter.WriteHeader(500)
    u.Data["json"] = map[string]string{"error": "A user with that username already exists"}
    fmt.Println(err)
    u.ServeJson()
}

The response looks correct at first glance, it is formatted as a JSON object, but the Content-Type header is set to text/plain, limiting its ability to be used correctly.

[astaxie]

func (u *UserController) GetAll() {
    users := models.GetAllUsers()
    u.Ctx.Output.SetStatus(300)
    u.Data["json"] = users
    u.ServeJson()
}

[natemara]

Thank you. What is the purpose of the Controller.Ctx.ResponseWriter.WriteHeader function if the Controller.Ctx.Output.SetStatus works with no side effects?

[astaxie]

Controller.Ctx.ResponseWriter.WriteHeader will directly write to the client,

while Controller.Ctx.Output.SetStatus will cache the status until output the content

[natemara]

Thanks