1.1 mobile agent platform Analysis and Comparison
Although the essence of the mobile agent is the status when the mobile code and code are suspended, that is, when the object is moved from one host to another, we can implement it ourselves, for
Using IP proxiesProxyhandler () format IP, first parameter, request target may be HTTP or HTTPS, corresponding settingBuild_opener () Initialize IPInstall_opener () Sets the proxy IP to global and automatically uses proxy IP when Urlopen () requests
First, why to set up the user AgentSome sites do not like to be accessed by the crawler, so will detect the connection object, if it is a crawler, that is, non-human click access, it will not let you continue to access, so in order to allow the
Python version: Python3ide:pycharm2017.3.3First, why to set up the user AgentSome sites do not like to be accessed by the crawler, so will detect the object, if it is a crawler, he will not let you access, by setting up the user agent to achieve the
Written in front
The topic is not the goal, mainly for more detailed understanding of the site's reverse climbing mechanism, if you really want to improve the amount of reading blog, high-quality content is essential.
Learn about the Web site's
Are you curious about the User-Agent that identifies the browser? Why does each browser contain Mozilla? View Source print?
1
Mozilla/5.0 (Windows NT 6.1; wow64) applewebkit/537.36 (khtml, like gecko) Chrome/27.0.1453.94 Safari/537.3
Urllib.request.urlopen (URL) is often used in crawlers to open web pages, such as getting page status return valuesThe problem is that Urlopen sends the version of Python urllib on the user-agent that is sent on the GET request, looking at the
Concept Proxy mode is one of the basic design patterns, which is an object that the developer inserts to replace the "actual" object in order to provide additional or different operations. These operations typically involve communication with an
This article, in conjunction with the previous article, "Python uses Youdao translation to achieve the" language translator "function" of the implementation code, processing, to achieve the request server to hide user-agent.There are two general
Definition: provides a proxy for other objects to control access to this object.
Type: Object-structured pattern
class Diagram:
roles involved in proxy mode
Abstract Theme Role (Subject): declares a common interface between the agent theme and the
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