通过修改HTTP报文头部，来成功获取网页内容！
python
import requests
r = requests.get("https://www.amazon.cn/gp/product/B01M8L5Z3Y")
r.status_code
r.encoding
>>> import requests
>>> r = requests.get("https://www.amazon.cn/gp/product/B01M8L5Z3Y")
>>> r.status_code
503
>>> r.encoding
'ISO-8859-1'
>>>
>>> r.encoding = r.apparent_encoding
>>> r.text
'<!DOCTYPE html>\n<!--[if lt IE 7]> <html lang="zh-CN" class="a-no-js a-lt-ie9 a-lt-ie8 a-lt-ie7"> <![endif]-->\n<!--[if IE 7]> <html lang="zh-CN" class="a-no-js a-lt-ie9 a-lt-ie8"> <![endif]-->\n<!--[if IE 8]> <html lang="zh-CN" class="a-no-js a-lt-ie9"> <![endif]-->\n<!--[if gt IE 8]><!-->\n<html class="a-no-js" lang="zh-CN"><!--<![endif]--><head>\n<meta http-equiv="content-type" content="text/html; charset=UTF-8">\n<meta charset="utf-8">\n<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">\n<title dir="ltr">Amazon CAPTCHA</title>\n<meta name="viewport" content="width=device-width">\n<link rel="stylesheet" href="https://images-na.ssl-images-amazon.com/images/G/01/AUIClients/AmazonUI-3c913031596ca78a3768f4e934b1cc02ce238101.secure.min._V1_.css">\n<script>\n\nif (true === true) {\n var ue_t0 = (+ new Date()),\n ue_csm = window,\n ue = { t0: ue_t0, d: function() { return (+new Date() - ue_t0); } },\n ue_furl = "fls-cn.amazon.cn",\n ue_mid = "AAHKV2X7AFYLW",\n ue_sid = (document.cookie.match(/session-id=([0-9-]+)/) || [])[1],\n ue_sn = "opfcaptcha.amazon.cn",\n ue_id = \'T33DQKKSXC8PZYZ4E5NQ\';\n}\n</script>\n</head>\n<body>\n\n<!--\n To discuss automated access to Amazon data please contact [email protected].\n For information about migrating to our APIs refer to our Marketplace APIs at https://developer.amazonservices.com.cn/index.html/ref=rm_c_sv, or our Product Advertising API at https://associates.amazon.cn/gp/advertising/api/detail/main.html/ref=rm_c_ac for advertising use cases.\n-->\n\n<!--\nCorreios.DoNotSend\n-->\n\n<div class="a-container a-padding-double-large" style="min-width:350px;padding:44px 0 !important">\n\n <div class="a-row a-spacing-double-large" style="width: 350px; margin: 0 auto">\n\n <div class="a-row a-spacing-medium a-text-center"><i class="a-icon a-logo"></i></div>\n\n <div class="a-box a-alert a-alert-info a-spacing-base">\n <div class="a-box-inner">\n <i class="a-icon a-icon-alert"></i>\n <h4>请输入您在下方看到的字符</h4>\n <p class="a-last">抱歉，我们只是想确认一下当前访问者并非自动程序。为了达到最佳效果，请确保您浏览器上的 Cookie 已启用。</p>\n </div>\n </div>\n\n <div class="a-section">\n\n <div class="a-box a-color-offset-background">\n <div class="a-box-inner a-padding-extra-large">\n\n <form method="get" action="/errors/validateCaptcha" name="">\n <input type=hidden name="amzn" value="FPQ3hpXcLlqNYaQR2w10gA==" /><input type=hidden name="amzn-r" value="/gp/product/B01M8L5Z3Y" />\n <div class="a-row a-spacing-large">\n <div class="a-box">\n <div class="a-box-inner">\n <h4>请输入您在这个图片中看到的字符：</h4>\n <div class="a-row a-text-center">\n <img src="https://images-na.ssl-images-amazon.com/captcha/cucusdhr/Captcha_bxyxvfyusz.jpg">\n </div>\n <div class="a-row a-spacing-base">\n <div class="a-row">\n <div class="a-column a-span6">\n <label for="captchacharacters">输入字符</label>\n </div>\n <div class="a-column a-span6 a-span-last a-text-right">\n <a οnclick="window.location.reload()">换一张图</a>\n </div>\n </div>\n <input autocomplete="off" spellcheck="false" id="captchacharacters" name="field-keywords" class="a-span12" autocapitalize="off" autocorrect="off" type="text">\n </div>\n </div>\n </div>\n </div>\n\n <div class="a-section a-spacing-extra-large">\n\n <div class="a-row">\n <span class="a-button a-button-primary a-span12">\n <span class="a-button-inner">\n <button type="submit" class="a-button-text">继续购物</button>\n </span>\n </span>\n </div>\n\n </div>\n </form>\n\n </div>\n </div>\n\n </div>\n\n </div>\n\n <div class="a-divider a-divider-section"><div class="a-divider-inner"></div></div>\n\n <div class="a-text-center a-spacing-small a-size-mini">\n <a href="https://www.amazon.cn/gp/help/customer/display.html/ref=footer_claim?ie=UTF8&nodeId=200347160">使用条件</a>\n <span class="a-letter-space"></span>\n <span class="a-letter-space"></span>\n <span class="a-letter-space"></span>\n <span class="a-letter-space"></span>\n <a href="https://www.amazon.cn/gp/help/customer/display.html/ref=footer_privacy?ie=UTF8&nodeId=200347130">隐私声明</a>\n </div>\n\n <div class="a-text-center a-size-mini a-color-secondary">\n © 1996-2015, Amazon.com, Inc. or its affiliates\n <script>\n if (true === true) {\n document.write(\'<img src="https://fls-cn.amaz\'+\'on.cn/\'+\'1/oc-csi/1/OP/requestId=T33DQKKSXC8PZYZ4E5NQ&js=1" />\');\n };\n </script>\n <noscript>\n <img src="https://fls-cn.amazon.cn/1/oc-csi/1/OP/requestId=T33DQKKSXC8PZYZ4E5NQ&js=0" />\n </noscript>\n </div>\n </div>\n <script>\n if (true === true) {\n var elem = document.createElement("script");\n elem.src = "https://images-cn.ssl-images-amazon.com/images/G/01/csminstrumentation/csm-captcha-instrumentation.min._V" + (+ new Date()) + "_.js";\n document.getElementsByTagName(\'head\')[0].appendChild(elem);\n }\n </script>\n</body></html>\n'
>>>
#说明不是网络错误，但是不可以访问！对网络爬虫的限制。一个是http的头,另外一个就是协议！
查看一下请求的头部！
>>> r.request.headers
{'User-Agent': 'python-requests/2.20.1', 'Accept-Encoding': 'gzip, deflate', 'Accept': '*/*', 'Connection': 'keep-alive'}
>>>#User-Agent': 'python-requests/2.20.1 诚实的告知对方我是“爬虫！”
更改头部信息！
>>> k = {'user-agent':'Mozilla/5.0'}
#构造键字对！ 用来修改头部！ Mozilla/5.0是浏览器的头！就是伪装成一个浏览器去进行访问！
然后！
>>> url = "https://www.amazon.cn/gp/product/B01M8L5Z3Y"
>>> r = requests.get(url,headers = k)
>>>
>>> r = requests.get(url,headers = k)
>>> r.request.headers
{'user-agent': 'Mozilla/5.0', 'Accept-Encoding': 'gzip, deflate', 'Accept': '*/*', 'Connection': 'keep-alive'}
>>>#已经变成： Mozilla/5.0
>>> r.status_code
200 #成功！
>>>
>>> r.status_code
200
>>> r.text[:10000]
'<!DOCTYPE html>\n<!--[if lt IE 7]> <html lang="zh-CN" class="a-no-js a-lt-ie9 a-lt-ie8 a-lt-ie7"> <![endif]-->\n<!--[if IE 7]> <html lang="zh-CN" class="a-no-js a-lt-ie9 a-lt-ie8"> <![endif]-->\n<!--[if IE 8]> <html lang="zh-CN" class="a-no-js a-lt-ie9"> <![endif]-->\n<!--[if gt IE 8]><!-->\n<html class="a-no-js" lang="zh-CN"><!--<![endif]--><head>\n<meta http-equiv="content-type" content="text/html; charset=UTF-8">\n<meta charset="utf-8">\n<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">\n<title dir="ltr">Amazon CAPTCHA</title>\n<meta name="viewport" content="width=device-width">\n<link rel="stylesheet" href="https://images-na.ssl-images-amazon.com/images/G/01/AUIClients/AmazonUI-3c913031596ca78a3768f4e934b1cc02ce238101.secure.min._V1_.css">\n<script>\n\nif (true === true) {\n var ue_t0 = (+ new Date()),\n ue_csm = window,\n ue = { t0: ue_t0, d: function() { return (+new Date() - ue_t0); } },\n ue_furl = "fls-cn.amazon.cn",\n ue_mid = "AAHKV2X7AFYLW",\n ue_sid = (document.cookie.match(/session-id=([0-9-]+)/) || [])[1],\n ue_sn = "opfcaptcha.amazon.cn",\n ue_id = \'Q7EMQ0MRT0KYC536Q05R\';\n}\n</script>\n</head>\n<body>\n\n<!--\n To discuss automated access to Amazon data please contact [email protected].\n For information about migrating to our APIs refer to our Marketplace APIs at https://developer.amazonservices.com.cn/index.html/ref=rm_c_sv, or our Product Advertising API at https://associates.amazon.cn/gp/advertising/api/detail/main.html/ref=rm_c_ac for advertising use cases.\n-->\n\n<!--\nCorreios.DoNotSend\n-->\n\n<div class="a-container a-padding-double-large" style="min-width:350px;padding:44px 0 !important">\n\n <div class="a-row a-spacing-double-large" style="width: 350px; margin: 0 auto">\n\n <div class="a-row a-spacing-medium a-text-center"><i class="a-icon a-logo"></i></div>\n\n <div class="a-box a-alert a-alert-info a-spacing-base">\n <div class="a-box-inner">\n <i class="a-icon a-icon-alert"></i>\n <h4>请è¾\x93å\x85¥æ\x82¨å\x9c¨ä¸\x8bæ\x96¹ç\x9c\x8bå\x88°ç\x9a\x84å\xad\x97符</h4>\n <p class="a-last">æ\x8a±æ\xad\x89ï¼\x8cæ\x88\x91们å\x8fªæ\x98¯æ\x83³ç¡®è®¤ä¸\x80ä¸\x8bå½\x93å\x89\x8d访é\x97®è\x80\x85并é\x9d\x9eè\x87ªå\x8a¨ç¨\x8båº\x8fã\x80\x82为äº\x86è¾¾å\x88°æ\x9c\x80ä½³æ\x95\x88æ\x9e\x9cï¼\x8c请确ä¿\x9dæ\x82¨æµ\x8fè§\x88å\x99¨ä¸\x8aç\x9a\x84 Cookie å·²å\x90¯ç\x94¨ã\x80\x82</p>\n </div>\n </div>\n\n <div class="a-section">\n\n <div class="a-box a-color-offset-background">\n <div class="a-box-inner a-padding-extra-large">\n\n <form method="get" action="/errors/validateCaptcha" name="">\n <input type=hidden name="amzn" value="byevvYbW69v2h8EgJ6MuPw==" /><input type=hidden name="amzn-r" value="/gp/product/B01M8L5Z3Y" />\n <div class="a-row a-spacing-large">\n <div class="a-box">\n <div class="a-box-inner">\n <h4>请è¾\x93å\x85¥æ\x82¨å\x9c¨è¿\x99个å\x9b¾ç\x89\x87ä¸\xadç\x9c\x8bå\x88°ç\x9a\x84å\xad\x97符ï¼\x9a</h4>\n <div class="a-row a-text-center">\n <img src="https://images-na.ssl-images-amazon.com/captcha/qamfifum/Captcha_biitgjptru.jpg">\n </div>\n <div class="a-row a-spacing-base">\n <div class="a-row">\n <div class="a-column a-span6">\n <label for="captchacharacters">è¾\x93å\x85¥å\xad\x97符</label>\n </div>\n <div class="a-column a-span6 a-span-last a-text-right">\n <a οnclick="window.location.reload()">æ\x8d¢ä¸\x80å¼\xa0å\x9b¾</a>\n </div>\n </div>\n <input autocomplete="off" spellcheck="false" id="captchacharacters" name="field-keywords" class="a-span12" autocapitalize="off" autocorrect="off" type="text">\n </div>\n </div>\n </div>\n </div>\n\n <div class="a-section a-spacing-extra-large">\n\n <div class="a-row">\n <span class="a-button a-button-primary a-span12">\n <span class="a-button-inner">\n <button type="submit" class="a-button-text">继ç»\xadè´\xadç\x89©</button>\n </span>\n </span>\n </div>\n\n </div>\n </form>\n\n </div>\n </div>\n\n </div>\n\n </div>\n\n <div class="a-divider a-divider-section"><div class="a-divider-inner"></div></div>\n\n <div class="a-text-center a-spacing-small a-size-mini">\n <a href="https://www.amazon.cn/gp/help/customer/display.html/ref=footer_claim?ie=UTF8&nodeId=200347160">使ç\x94¨æ\x9d¡ä»¶</a>\n <span class="a-letter-space"></span>\n <span class="a-letter-space"></span>\n <span class="a-letter-space"></span>\n <span class="a-letter-space"></span>\n <a href="https://www.amazon.cn/gp/help/customer/display.html/ref=footer_privacy?ie=UTF8&nodeId=200347130">é\x9a\x90ç §\x81声æ\x98\x8e</a>\n </div>\n\n <div class="a-text-center a-size-mini a-color-secondary">\n © 1996-2015, Amazon.com, Inc. or its affiliates\n <script>\n if (true === true) {\n document.write(\'<img src="https://fls-cn.amaz\'+\'on.cn/\'+\'1/oc-csi/1/OP/requestId=Q7EMQ0MRT0KYC536Q05R&js=1" />\');\n };\n </script>\n <noscript>\n <img src="https://fls-cn.amazon.cn/1/oc-csi/1/OP/requestId=Q7EMQ0MRT0KYC536Q05R&js=0" />\n </noscript>\n </div>\n </div>\n <script>\n if (true === true) {\n var elem = document.createElement("script");\n elem.src = "https://images-cn.ssl-images-amazon.com/images/G/01/csminstrumentation/csm-captcha-instrumentation.min._V" + (+ new Date()) + "_.js";\n document.getElementsByTagName(\'head\')[0].appendChild(elem);\n }\n </script>\n</body></html>\n'
>>>
#已经是正常的文本啦！
就是通过修改HTTP报文头部，来成功获取网页内容！
标签：HTTP,cn,python,t0,爬取,amazon,ue,requests,true From： https://blog.51cto.com/dream666uping/5855072