What is the standard format for a browser’s User-Agent string?

The User-Agent header is part of the RFC7231, which is an improved version of the RFC1945, where it states: The User-Agent request-header field contains information about the user agent originating the request. This is for statistical purposes, the tracing of protocol violations, and automated recognition of user agents for the sake of tailoring responses to … Read more

Why does Internet Explorer (9) report “Mozilla” in UserAgent?

this should do it: http://en.wikipedia.org/wiki/Mozilla When users visit a website (via a user agent such as a web browser), a text string is generally sent to identify the user agent to the web server. It is known as the “user agent string”. The Netscape web browser identified itself as “Mozilla/” followed by some information about … Read more

Why does Chrome use sec-ch-ua: “\”Not\\A;Brand”;v=”99″?

It seems that it’s part of Chromium’s GREASEing strategy: User agents’ brands containing more than a single entry could encourage standardized processing of the UA string. By randomly including additional, intentionally incorrect, comma-separated entries with arbitrary ordering, they would reduce the chance that we ossify on a few required strings. Looking at the Chromium repository, … Read more

Setting user agent of a java URLConnection

Just for clarification: setRequestProperty(“User-Agent”, “Mozilla …”) now works just fine and doesn’t append java/xx at the end! At least with Java 1.6.30 and newer. I listened on my machine with netcat(a port listener): $ nc -l -p 8080 It simply listens on the port, so you see anything which gets requested, like raw http-headers. And … Read more

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