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The user agent string format is currently specified by section 10.1.5 of HTTP Semantics. The format of the user agent string in HTTP is a list of product tokens (keywords) with optional comments. For example, if a user's product were called WikiBrowser, their user agent string might be WikiBrowser/1.0 Gecko/1.0. The "most important" product ...
If the user navigates back to a previous page a browser may still show you a page that has been stored on disk in the history store. This is correct behavior according to the specification. Many user agents show different behavior in loading pages from the history store or cache depending on whether the protocol is HTTP or HTTPS.
User-agent: BadBot # replace 'BadBot' with the actual user-agent of the bot User-agent: Googlebot Disallow: /private/ Example demonstrating how comments can be used: # Comments appear after the "#" symbol at the start of a line, or after a directive User-agent: * # match all bots Disallow: / # keep them out
This includes all web browsers, such as Google Chrome and Safari, some email clients, standalone download managers like youtube-dl, and other command-line utilities like cURL. [2] The user agent is the client in a client–server system. The HTTP User-Agent header is intended to clearly identify the agent to the server. [2]
This function returns a string with one or more access method specifications. These specifications cause the user agent to use a particular proxy server or to connect directly. [1] Multiple specifications provide a fallback when a proxy fails to respond. The browser fetches this PAC file before requesting other URLs.
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A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD. A user agent may automatically redirect a request. A user agent should detect and intervene to prevent cyclical redirects. [1]: §15.4 300 Multiple Choices
Spoofing some of the information exposed to the fingerprinter (e.g. the user agent) may create a reduction in diversity, [51]: 13 but the contrary could be also achieved if the spoofed information differentiates the user from all the others who do not use such a strategy more than the real browser information. [10]: 552