Request address: URL
Request method: HEAD, GET, POST, PUT, OPTIONS, DELETE, PATCH
User-Agent: Tell the server the relevant information of the client (if it is a browser, there will be information such as version, kernel, etc.)
referer: Tell the server from which page this request is sent (hot chain protection)
X-Requested-With: Tell the server this It is an ajax request
cookie: the
request header of the cookie information brought to the server can be specified and added in the code. In the form of a key-value pair, call: addHeader(String name, String value) to add a name to the request object , the request header whose value is value