Add JSON or Apache access log formatting option to config:  AccessLogsFormat = JSON_FORMAT or APACHE_FORMAT  ref #2738

Add the ability to unregister fixed routes

Add sys env feature 

add Enum field to Schema

1.Add Mutual HTTPS  Option!

avoid unnecessary read of large log file

If w.MaxLines is not set, there is no need to calc large log file’s lines. It may takes more than 10mins to calc a 10G file.

Update for MySQL timezone detection bug

Use "DefaultTimeLoc" for "al.TZ" default value
Don't set TZ on alias when t.Location() is empty

You can set your MySQL server timezone on main.go init function.
Example :
orm.DefaultTimeLoc, _ = time.LoadLocation("Europe/Paris")

Typo fixed

remove omitempty for swagger.Response.Description, because it's Required according to Swagger2.0 Spec

add custom middleware options for beego.Run()

remove omitempty for swagger.Response.Description, because it's Required according to Swagger2.0 Spec

misc: fix typos

add XMLBody method for httplib

fix typo

use continue instead of return

Certain web application inherit most of the routes from a base application by using the underscore import 
(e.g. import _ "myoldapp.com/routers").
The new application might want to only overwrite certain pages, such as "/about" or "/faq"

The proposed new UnregisterFixedRoute method allows unregistering of the specified paths.
 Usage (replace "GET" with "*" for all methods):
  beego.UnregisterFixedRoute("/yourpreviouspath", "GET")
  beego.Router("/yourpreviouspath", yourControllerAddress, "get:GetNewPage")
The children paths are left intact.
For example, /yourpreviouspath/oldchildsubpath should still continue to function in legacy mode.