flask框架写接口

采用 flask 框架，写一个简单的接口

from flask import Flask, jsonify, request

app = Flask(__name__)

@app.route('/hello',methods=['GET'])
def hello():
    name = 'world'
    if 'name' in request.args:
        name = request.args['name']
    data = {'data': 'hello ' + name}
    return jsonify(data)

if __name__ == '__main__':
    app.config['JSON_AS_ASCII'] = False
    app.run(port=5001)

程序启动后输出：

* Serving Flask app "tmp" (lazy loading)
 * 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://127.0.0.1:5001/ (Press CTRL+C to quit)
127.0.0.1 - - [12/Nov/2020 15:13:08] "GET /hello?name=nikey HTTP/1.1" 200 -
127.0.0.1 - - [12/Nov/2020 15:13:14] "GET /hello?name=test HTTP/1.1" 200 -

访问url：http://127.0.0.1:5001/hello?name=test

输出json数据：{"data":"hello test"}

 

访问url：http://127.0.0.1:5001/hello

输出json数据：{"data":"hello world"}

 

跨域问题

• 接口提供给web使用时，ajax调用会遇到跨域问题，需修改response，设置 Access-Control-Allow-Origin 来解决

from flask import Flask,jsonify,request,make_response

# 初始化
app = Flask(__name__)

# 通过python装饰器的方法定义一个路由地址/hello,接口的uri
@app.route('/hello', methods=['GET'])
def hello():
    name = 'world'
    if 'name' in request.args:
        name = request.args['name']
    data = jsonify({'data': 'hello '+ name})

    # 解决ajax请求跨域问题
    res = make_response(data)
    res.headers['Access-Control-Allow-Origin'] = '*'

    print("返回结果是：", res)
    print(type(res))
    print(res.json)
    print(res.status)
    print(res.status_code)
    print(res.data)
    print(res.response)
    print(dir(res))
    print("================================")

    return res

if __name__ == '__main__':
    app.config['JSON_AS_ASCII'] = False
    # host设置0.0.0.0的话可以使用公网ip访问
    # port是设置的端口号，port不填的话默认5000
    app.run(
        host='0.0.0.0',
        port=5001,
        debug=True
        )

输出结果：

 * Detected change in 'D:\\Nikey\\Python\\PyCharm\\basicProgram\\爬虫\\异步爬虫\\tmp.py', reloading
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 270-044-639
 * Running on http://0.0.0.0:5001/ (Press CTRL+C to quit)
返回结果是： <Response 28 bytes [200 OK]>
<class 'flask.wrappers.Response'>
{'data': 'hello test3'}
200 OK
200
b'{\n  "data": "hello test3"\n}\n'
[b'{\n  "data": "hello test3"\n}\n']
['__call__', '__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__enter__', '__eq__', '__exit__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_cached_json', '_ensure_sequence', '_get_data_for_json', '_is_range_request_processable', '_on_close', '_process_range_request', '_status', '_status_code', '_wrap_response', 'accept_ranges', 'access_control_allow_credentials', 'access_control_allow_headers', 'access_control_allow_methods', 'access_control_allow_origin', 'access_control_expose_headers', 'access_control_max_age', 'add_etag', 'age', 'allow', 'autocorrect_location_header', 'automatically_set_content_length', 'cache_control', 'calculate_content_length', 'call_on_close', 'charset', 'close', 'content_encoding', 'content_language', 'content_length', 'content_location', 'content_md5', 'content_range', 'content_security_policy', 'content_security_policy_report_only', 'content_type', 'data', 'date', 'default_mimetype', 'default_status', 'delete_cookie', 'direct_passthrough', 'expires', 'force_type', 'freeze', 'from_app', 'get_app_iter', 'get_data', 'get_etag', 'get_json', 'get_wsgi_headers', 'get_wsgi_response', 'headers', 'implicit_sequence_conversion', 'is_json', 'is_sequence', 'is_streamed', 'iter_encoded', 'json', 'json_module', 'last_modified', 'location', 'make_conditional', 'make_sequence', 'max_cookie_size', 'mimetype', 'mimetype_params', 'on_json_loading_failed', 'response', 'retry_after', 'set_cookie', 'set_data', 'set_etag', 'status', 'status_code', 'stream', 'vary', 'www_authenticate']
================================
127.0.0.1 - - [12/Nov/2020 15:44:10] "GET /hello?name=test3 HTTP/1.1" 200 -

 

 

问题：运行flask接口程序后，报错“TypeError: required field "type_ignores" missing from Module”

解决方法：升级Werkzeug包为0.15.5版本，或者更高版本，即可解决问题；

升级Werkzeug：pip install --upgrade Werkzeug

 

 

 

本文地址：https://blog.csdn.net/nikeylee/article/details/109644335