Python开发的HTTP库requests详解

Requests 是使用 Apache2 Licensed 许可证的 基于Python开发的HTTP 库，其在Python内置模块的基础上进行了高度的封装，从而使得Pythoner进行网络请求时，变得美好了许多，使用Requests可以轻而易举的完成浏览器可有的任何操作。

1. GET请求

 # 1、无参数实例
  
 import requests
  
 ret = requests.get('https://github.com/timeline.json')
  
 print(ret.url)
 print(ret.text)

 # 2、有参数实例
  
 import requests
  
 payload = {'key1': 'value1','key2': 'value2'}
 ret = requests.get("http://httpbin.org/get",params=payload)
  
 print(ret.url)
 print(ret.text)

2. POST请求

 # 1、基本POST实例
  
 import requests
  
 payload = {'key1': 'value1','key2': 'value2'}
 ret = requests.post("http://httpbin.org/post",data=payload)
  
 print(ret.text)
  
  
 # 2、发送请求头和数据实例
  
 import requests
 import json
  
 url = 'https://api.github.com/some/endpoint'
 payload = {'some': 'data'}
 headers = {'content-type': 'application/json'}
  
 ret = requests.post(url,data=json.dumps(payload),headers=headers)
  
 print(ret.text)
 print(ret.cookies)

3. 其它请求

 requests.get(url,params=None,**kwargs)
 requests.post(url,data=None,json=None,**kwargs)
 requests.put(url,**kwargs)
 requests.head(url,**kwargs)
 requests.delete(url,**kwargs)
 requests.patch(url,**kwargs)
 requests.options(url,**kwargs)
  
 # 以上方法均是在此方法的基础上构建
 requests.request(method,url,**kwargs)

4. 请求参数

def request(method,**kwargs):
  """Constructs and sends a :class:`Request <Request>`.

  :param method: method for the new :class:`Request` object.
  :param url: URL for the new :class:`Request` object.
  :param params: (optional) Dictionary or bytes to be sent in the query string for the :class:`Request`.
  :param data: (optional) Dictionary,bytes,or file-like object to send in the body of the :class:`Request`.
  :param json: (optional) json data to send in the body of the :class:`Request`.
  :param headers: (optional) Dictionary of HTTP Headers to send with the :class:`Request`.
  :param cookies: (optional) Dict or CookieJar object to send with the :class:`Request`.
  :param files: (optional) Dictionary of ``'name': file-like-objects`` (or ``{'name': file-tuple}``) for multipart encoding upload.
    ``file-tuple`` can be a 2-tuple ``('filename',fileobj)``,3-tuple ``('filename',fileobj,'content_type')``
    or a 4-tuple ``('filename','content_type',custom_headers)``,where ``'content-type'`` is a string
    defining the content type of the given file and ``custom_headers`` a dict-like object containing additional headers
    to add for the file.
  :param auth: (optional) Auth tuple to enable Basic/Digest/Custom HTTP Auth.
  :param timeout: (optional) How long to wait for the server to send data
    before giving up,as a float,or a :ref:`(connect timeout,read
    timeout) <timeouts>` tuple.
  :type timeout: float or tuple
  :param allow_redirects: (optional) Boolean. Set to True if POST/PUT/DELETE redirect following is allowed.
  :type allow_redirects: bool
  :param proxies: (optional) Dictionary mapping protocol to the URL of the proxy.
  :param verify: (optional) whether the SSL cert will be verified. A CA_BUNDLE path can also be provided. Defaults to ``True``.
  :param stream: (optional) if ``False``,the response content will be immediately downloaded.
  :param cert: (optional) if String,path to ssl client cert file (.pem). If Tuple,('cert','key') pair.
  :return: :class:`Response <Response>` object
  :rtype: requests.Response

  Usage::

   >>> import requests
   >>> req = requests.request('GET','http://httpbin.org/get')
   <Response [200]>
  """

5. 参数示例

def param_method_url():
  # requests.request(method='get',url='http://127.0.0.1:8000/test/')
  # requests.request(method='post',url='http://127.0.0.1:8000/test/')
  pass


def param_param():
  # - 可以是字典
  # - 可以是字符串
  # - 可以是字节（ascii编码以内）

  # requests.request(method='get',# url='http://127.0.0.1:8000/test/',# params={'k1': 'v1','k2': '水电费'})

  # requests.request(method='get',# params="k1=v1&k2=水电费&k3=v3&k3=vv3")

  # requests.request(method='get',# params=bytes("k1=v1&k2=k2&k3=v3&k3=vv3",encoding='utf8'))

  # 错误
  # requests.request(method='get',# params=bytes("k1=v1&k2=水电费&k3=v3&k3=vv3",encoding='utf8'))
  pass


def param_data():
  # 可以是字典
  # 可以是字符串
  # 可以是字节
  # 可以是文件对象

  # requests.request(method='POST',# data={'k1': 'v1','k2': '水电费'})

  # requests.request(method='POST',# data="k1=v1; k2=v2; k3=v3; k3=v4"
  # )

  # requests.request(method='POST',# data="k1=v1;k2=v2;k3=v3;k3=v4",# headers={'Content-Type': 'application/x-www-form-urlencoded'}
  # )

  # requests.request(method='POST',# data=open('data_file.py',mode='r',encoding='utf-8'),# 文件内容是：k1=v1;k2=v2;k3=v3;k3=v4
  # headers={'Content-Type': 'application/x-www-form-urlencoded'}
  # )
  pass


def param_json():
  # 将json中对应的数据进行序列化成一个字符串，json.dumps(...)
  # 然后发送到服务器端的body中，并且Content-Type是 {'Content-Type': 'application/json'}
  requests.request(method='POST',url='http://127.0.0.1:8000/test/',json={'k1': 'v1','k2': '水电费'})


def param_headers():
  # 发送请求头到服务器端
  requests.request(method='POST','k2': '水电费'},headers={'Content-Type': 'application/x-www-form-urlencoded'}
           )


def param_cookies():
  # 发送Cookie到服务器端
  requests.request(method='POST',data={'k1': 'v1','k2': 'v2'},cookies={'cook1': 'value1'},)
  # 也可以使用CookieJar（字典形式就是在此基础上封装）
  from http.cookiejar import CookieJar
  from http.cookiejar import Cookie

  obj = CookieJar()
  obj.set_cookie(Cookie(version=0,name='c1',value='v1',port=None,domain='',path='/',secure=False,expires=None,discard=True,comment=None,comment_url=None,rest={'HttpOnly': None},rfc2109=False,port_specified=False,domain_specified=False,domain_initial_dot=False,path_specified=False)
          )
  requests.request(method='POST',cookies=obj)


def param_files():
  # 发送文件
  # file_dict = {
  # 'f1': open('readme','rb')
  # }
  # requests.request(method='POST',# files=file_dict)

  # 发送文件，定制文件名
  # file_dict = {
  # 'f1': ('test.txt',open('readme','rb'))
  # }
  # requests.request(method='POST',"hahsfaksfa9kasdjflaksdjf")
  # }
  # requests.request(method='POST',# files=file_dict)

  # 发送文件，定制文件名
  # file_dict = {
  #   'f1': ('test.txt',"hahsfaksfa9kasdjflaksdjf",'application/text',{'k1': '0'})
  # }
  # requests.request(method='POST',#         url='http://127.0.0.1:8000/test/',#         files=file_dict)

  pass


def param_auth():
  from requests.auth import HTTPBasicAuth,HTTPDigestAuth

  ret = requests.get('https://api.github.com/user',auth=HTTPBasicAuth('wupeiqi','sdfasdfasdf'))
  print(ret.text)

  # ret = requests.get('http://192.168.1.1',# auth=HTTPBasicAuth('admin','admin'))
  # ret.encoding = 'gbk'
  # print(ret.text)

  # ret = requests.get('http://httpbin.org/digest-auth/auth/user/pass',auth=HTTPDigestAuth('user','pass'))
  # print(ret)
  #


def param_timeout():
  # ret = requests.get('http://google.com/',timeout=1)
  # print(ret)

  # ret = requests.get('http://google.com/',timeout=(5,1))
  # print(ret)
  pass


def param_allow_redirects():
  ret = requests.get('http://127.0.0.1:8000/test/',allow_redirects=False)
  print(ret.text)


def param_proxies():
  # proxies = {
  # "http": "61.172.249.96:80",# "https": "http://61.185.219.126:3128",# }

  # proxies = {'http://10.20.1.128': 'http://10.10.1.10:5323'}

  # ret = requests.get("http://www.proxy360.cn/Proxy",proxies=proxies)
  # print(ret.headers)


  # from requests.auth import HTTPProxyAuth
  #
  # proxyDict = {
  # 'http': '77.75.105.165',# 'https': '77.75.105.165'
  # }
  # auth = HTTPProxyAuth('username','mypassword')
  #
  # r = requests.get("http://www.google.com",proxies=proxyDict,auth=auth)
  # print(r.text)

  pass


def param_stream():
  ret = requests.get('http://127.0.0.1:8000/test/',stream=True)
  print(ret.content)
  ret.close()

  # from contextlib import closing
  # with closing(requests.get('http://httpbin.org/get',stream=True)) as r:
  # # 在此处理响应。
  # for i in r.iter_content():
  # print(i)


def requests_session():
  import requests

  session = requests.Session()

  ### 1、首先登陆任何页面，获取cookie

  i1 = session.get(url="http://dig.chouti.com/help/service")

  ### 2、用户登陆，携带上一次的cookie，后台对cookie中的 gpsd 进行授权
  i2 = session.post(
    url="http://dig.chouti.com/login",data={
      'phone': "8615131255089",'password': "xxxxxx",'oneMonth': ""
    }
  )

  i3 = session.post(
    url="http://dig.chouti.com/link/vote?linksId=8589623",)
  print(i3.text)

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