Technology sharing | detailed explanation of actual combat interface test request methods get, post

1、 The request method is different

2、post Can be attached body, Can support form、json、xml、binary And various data formats

3、 From the perspective of Industry General specifications , If there is no data change to the database , For example, query operation , It is recommended to use GET request , Data writing and status are recommended with POST request

Demonstration environment construction

In order to avoid the interference of other factors , Use flask Write a simple one demo server.

1、 install flask

pip install flask

1. Create a hello.py file

from flask import Flask, request

app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

@app.route("/request", methods=['POST', 'GET'])
def hellp():
    # Get request Parameters 
    query = request.args
    # Get request form
    post = request.form
    # Print the obtained parameters and form
    return f"query: {query}\n"\
           f"post: {post}"

1. Start the service

export FLASK_APP=hello.py
flask run

The following information indicates that the construction is successful

 * Serving Flask app "hello.py"
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

cURL Command initiation GET、POST request

launch GET request ,a、b Parameters are put into URL Sent in , And keep it in get In file

curl 'http://127.0.0.1:5000/request?a=1&b=2' -v -s &>get

launch POST request ,a、b Parameter with form-data Format send , And keep it in post In file

 curl 'http://127.0.0.1:5000/request?' -d "a=1&b=2" -v -s &>post

GET、POST Request comparison

Be careful :> On the right side of is the request content ,< On the right is the response content

GET Request process

*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 5000 (#0)
> GET /request?a=1&b=2 HTTP/1.1
> Host: 127.0.0.1:5000
> User-Agent: curl/7.64.1
> Accept: */*
>
* HTTP 1.0, assume close after body
< HTTP/1.0 200 OK
< Content-Type: text/html; charset=utf-8
< Content-Length: 80
< Server: Werkzeug/0.14.1 Python/3.7.5
< Date: Wed, 01 Apr 2020 07:35:42 GMT
<
{ [80 bytes data]
* Closing connection 0
query: ImmutableMultiDict([('a', '1'), ('b', '2')])
post: ImmutableMultiDict([])

POST Request process

*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 5000 (#0)
> POST /request?a=1&b=2 HTTP/1.1
> Host: 127.0.0.1:5000
> User-Agent: curl/7.64.1
> Accept: */*
> Content-Length: 7
> Content-Type: application/x-www-form-urlencoded
>
} [7 bytes data]
* upload completely sent off: 7 out of 7 bytes
* HTTP 1.0, assume close after body
< HTTP/1.0 200 OK
< Content-Type: text/html; charset=utf-8
< Content-Length: 102
< Server: Werkzeug/0.14.1 Python/3.7.5
< Date: Wed, 01 Apr 2020 08:15:08 GMT
<
{ [102 bytes data]
* Closing connection 0
query: ImmutableMultiDict([('a', '1'), ('b', '2')])
post: ImmutableMultiDict([('c', '3'), ('d', '4')])

Compare the two files ：

image1080×490 127 KB

You can see clearly from the picture GET Requested method by GET,POST Requested method by POST, Besides ,GET The request did not Content-Type as well as Content-Length These two fields , And... In the request line URL with query Parameters are the formats allowed by both requests .