1. Request data and its acquisition

1.1 Request relevant data

The data related to the request is the parameters taken when sending

1.2 Fixed parameters and converters

1.2.1 Fixed parameter

Fixed parameter ： Referring to URL Fixed in , Is an inaccessible part , Different from query string , Query strings are optional .

@app.route('/hello/<int:id>/<name>')
def hello(id,name):
    return " The received ID yes ：%s,name yes %s"%(id,name)

1.2.2 converter

The converter is to make a string meet a regx Properties of , Make regular judgments
Custom converter can meet the required functions

# 1. Import converter base class 
from werkzeug.routing import BaseConverter

# 2. Inherit the converter base class and implement regex Method 
class PhoneConverter(BaseConverter):
    regex = r'1[3-9][0-9]{9}'

# 3. Mount the custom converter to flask On the object 
app.url_map.converters["phone"] = PhoneConverter

#  Use custom Converter 
@app.route('/phone/<phone:my_phone>')
def get_phone(my_phone):
    return " The current mobile number is ：%s"%my_phone

1.3 Acquisition of query parameters

#  Acquisition of query parameters 
# 1. Import request object 
from flask import request
@app.route('/query')
def query():
    #  Convert the immutable dictionary type to normal dict type 
    params = request.args.to_dict()
    print(params)
    print(type(params))
    name = request.args.get("name")
    age = request.args.get("age")
    return " The current name is %s, Age is %s"%(name,age)

1.4 Query form data acquisition

from flask import request
@app.route("/form",methods=["post"])
def form():
    name = request.form.get("name")
    age = request.form.get("age")
    return " The name is %s, Age is %s"%(name,age)

1.5 Upload files

from flask import request
@app.route("/form",methods=["post"])
def form():
    name = request.form.get("name")
    age = request.form.get("age")
    return " The name is %s, Age is %s"%(name,age)

@app.route("/upload",methods=["post"])
def upload():
    img = request.files.get("img")
    print(img)
    img.save("./static/01.png")
    return " Upload files "

2. The response data

2.1 Response return HTML page

from flask import render_template
@app.route('/page')
def page():
    return render_template("hello.html")

2.2 Redirect jump page

#  Redirect jump page 
from flask import redirect
@app.route('/jump')
def jump():
    return redirect("https://www.baidu.com/")

2.3 return json data

from flask import jsonify
@app.route("/return_json")
def return_json():
    data = {
    
        "name" : "zhangsan",
        "age" : 18,
        "action":[" eat "," sleep "," Use the toilet "]
    }
    return jsonify(data)

2.4 Return tuple data

from flask import jsonify
@app.route("/return_tuple")
def return_tuple():
    return ("hello",400,{
    
        "aaaa":"bbbb"
    })

3. Custom response

from flask import make_response
@app.route("/return_obj")
def return_obj():
    resp = make_response("hello")
    resp.status = "404"
    resp.headers["aaa"] = "bbb"
    return resp