HTTP has many URL methods.
The default route only responds to GET requests, but we can pass the methods parameter
in the decorator app.route to change the request method,
@app.route('/login/',methods=['GET','POST'])
@app.route('/login/<id>',methods=['GET','POST'])
If GET exists, the HEAD method will also be added automatically.
Since Flask0.6, automatic processing of OPTIONS has also been realized.
HTTP methods and usage scenarios:
GET: Get resources, GET operations should be idempotent
HEAD: Want to get information, but only care about the message header. The application should handle it like a GET request, but without returning actual content
POST: create a new resource
PUT: Completely replace or create a resource. Although the PUT operation has side effects, it should also be idempotent.
DELETE: delete resource. DELETE operations have side effects, but are also idempotent.
OPTIONS: Get the HTTP methods supported by the resource.
PATCH: Partial update, modifying an existing resource.
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