function call stacklast-in-first-out feature to cleverly complete the post-processing operations completed by the middleware in the custom processing function.
Django's processing method is to define a class, define a method for processing before request processing, and define a method for processing after request processing. gin's way is more flexible, but django's way is clearer.Request parameter binding
For obtaining request content, in model binding, there are the following scenarios- Binding failure is Should the user handle it himself or should the framework handle it uniformly?
- Does the user need to care about the content of the request and choose a different binder?
// 自动更加请求头选择不同的绑定器对象进行处理
func (c *Context) Bind(obj interface{}) error {
b := binding.Default(c.Request.Method, c.ContentType())
return c.MustBindWith(obj, b)
}
// 绑定失败后，框架会进行统一的处理
func (c *Context) MustBindWith(obj interface{}, b binding.Binding) (err error) {
if err = c.ShouldBindWith(obj, b); err != nil {
c.AbortWithError(400, err).SetType(ErrorTypeBind)
}
return
}
// 用户可以自行选择绑定器，自行对出错处理。自行选择绑定器，这也意味着用户可以自己实现绑定器。
// 例如：嫌弃默认的json处理是用官方的json处理包，嫌弃它慢，可以自己实现Binding接口
func (c *Context) ShouldBindWith(obj interface{}, b binding.Binding) error {
return b.Bind(c.Request, obj)
}