Python爬虫库requests获取响应内容、响应状态码、响应头

时间：2020-10-21 python爬虫查看: 974

首先在程序中引入Requests模块

import requests

一、获取不同类型的响应内容

在发送请求后，服务器会返回一个响应内容，而且requests通常会自动解码响应内容

1.文本响应内容

获取文本类型的响应内容

r = requests.get('https://www.baidu.com')
r.text # 通过文本的形式获取响应内容

'<!DOCTYPE html>\r\n<!--STATUS OK--><html> <head><meta http-equiv=content-type content=text/html;charset=utf-8><meta http-equiv=X-UA-Compatible content=IE=Edge><meta content=always name=referrer><link rel=stylesheet type=text/css href=https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/bdorz/baidu.min.css><title>ç\x99¾åo|ä¸\x80ä¸\x8bï¼\x8cä½\xa0å°±ç\x9f￥é\x81\x93</title></head> <body link=#0000cc> <div id=wrapper> <div id=head> <div class=head_wrapper> <div class=s_form> <div class=s_form_wrapper> <div id=lg> <img hidefocus=true src=//www.baidu.com/img/bd_logo1.png width=270 height=129> </div> <form id=form name=f action=//www.baidu.com/s class=fm> <input type=hidden name=bdorz_come value=1> <input type=hidden name=ie value=utf-8> <input type=hidden name=f value=8> <input type=hidden name=rsv_bp value=1> <input type=hidden name=rsv_idx value=1> <input type=hidden name=tn value=baidu><span class="bg s_ipt_wr"><input id=kw name=wd class=s_ipt value maxlength=255 autocomplete=off autofocus=autofocus></span><span class="bg s_btn_wr"><input type=submit id=su value=ç\x99¾åo|ä¸\x80ä¸\x8b class="bg s_btn" autofocus></span> </form> </div> </div> <div id=u1> <a href=http://news.baidu.com name=tj_trnews class=mnav>æ\x96°é\x97»</a> <a href=https://www.hao123.com name=tj_trhao123 class=mnav>hao123</a> <a href=http://map.baidu.com name=tj_trmap class=mnav>å\x9c°å\x9b¾</a> <a href=http://v.baidu.com name=tj_trvideo class=mnav>è§\x86é￠\x91</a> <a href=http://tieba.baidu.com name=tj_trtieba class=mnav>è′′å\x90§</a> <noscript> <a href=http://www.baidu.com/bdorz/login.gif?login&amp;tpl=mn&amp;u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1 name=tj_login class=lb>ç\x99»å½\x95</a> </noscript> <script>document.write(\'<a href="http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u=\'+ encodeURIComponent(window.location.href+ (window.location.search === " rel="external nofollow" " ? "?" : "&")+ "bdorz_come=1")+ \'" name="tj_login" class="lb">ç\x99»å½\x95</a>\');\r\n        </script> <a href=//www.baidu.com/more/ name=tj_briicon class=bri style="display: block;">æ\x9b′å¤\x9aäo§å\x93\x81</a> </div> </div> </div> <div id=ftCon> <div id=ftConw> <p id=lh> <a href=http://home.baidu.com>å\x853äo\x8eç\x99¾åo|</a> <a href=http://ir.baidu.com>About Baidu</a> </p> <p id=cp>&copy;2017&nbsp;Baidu&nbsp;<a href=http://www.baidu.com/duty/>ä½¿ç\x94¨ç\x99¾åo|å\x89\x8då¿\x85èˉ»</a>&nbsp; <a href=http://jianyi.baidu.com/ class=cp-feedback>æ\x84\x8fè§\x81å\x8f\x8dé|\x88</a>&nbsp;äo¬ICPèˉ\x81030173å\x8f·&nbsp; <img src=//www.baidu.com/img/gs.gif> </p> </div> </div> </div> </body> </html>\r\n'

通过encoding来获取响应内容的编码以及修改编码

r.encoding

'ISO-8859-1'

2.二进制响应内容

r.content # 通过content获取的内容便是二进制类型的

3.JSON响应内容

r.json()

4.原始响应内容

r = requests.get('https://www.baidu.com',stream=True)
print(r.raw) # 就是urllib中的HTTPResponse对象
print(r.raw.read(10))

<requests.packages.urllib3.response.HTTPResponse object at 0x00000077940AEEF0>
b'\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\x03'

二、响应状态码

获取响应状态码

r = requests.get('https://www.baidu.com')
r.status_code

判断响应状态码

r.status_code == requests.codes.ok

True

当发送一个错误请求时，抛出异常

bad_r = requests.get('http://httpbin.org/status/404')
print(bad_r.status_code)
bad_r.raise_for_status()

404



---------------------------------------------------------------------------

HTTPError                 Traceback (most recent call last)

<ipython-input-15-9b812f4c5860> in <module>()
   1 bad_r = requests.get('http://httpbin.org/status/404')
   2 print(bad_r.status_code)
----> 3 bad_r.raise_for_status()


D:\Anaconda3\lib\site-packages\requests\models.py in raise_for_status(self)
  926 
  927     if http_error_msg:
--> 928       raise HTTPError(http_error_msg, response=self)
  929 
  930   def close(self):


HTTPError: 404 Client Error: NOT FOUND for url: http://httpbin.org/status/404

三、响应头

获取响应头

r = requests.get('https://www.baidu.com')
r.headers

{'Cache-Control': 'private, no-cache, no-store, proxy-revalidate, no-transform', 'Connection': 'Keep-Alive', 'Content-Encoding': 'gzip', 'Content-Type': 'text/html', 'Date': 'Mon, 23 Jul 2018 09:04:12 GMT', 'Last-Modified': 'Mon, 23 Jan 2017 13:23:51 GMT', 'Pragma': 'no-cache', 'Server': 'bfe/1.0.8.18', 'Set-Cookie': 'BDORZ=27315; max-age=86400; domain=.baidu.com; path=/', 'Transfer-Encoding': 'chunked'}

获取响应头的具体字段

print(r.headers['Server'])
print(r.headers.get('Server'))

bfe/1.0.8.18
bfe/1.0.8.18

更多关于Python爬虫库requestsr的使用方法请查看下面的相关链接

requests | urllib |

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