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When your browser requests a web page from a server via HTTP, it sends a set of headers with various bits of information about itself. Below you can see the headers sent by your browser.

HTTP headers supplied by your browser (34.228.52.21): Connection: Keep-Alive Host: pgl.yoyo.org Accept-Encoding: br,gzip If-Modified-Since: Mon, 02 Oct 2023 14:22:31 GMT Accept-Language: en-US,en;q=0.5 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 User-Agent: CCBot/2.0 (https://commoncrawl.org/faq/)

NB: If you see a header named "Referer" and are wondering why it's spelled incorrectly, it's because the original specification for HTTP/1.0 got it wrong, OK? Please stop asking me about this. From RFC 2616: "The Referer[sic] request-header field allows the client to specify, for the server's benefit, the address (URI) of the resource from which the Request-URI was obtained (the "referrer", although the header field is misspelled.)".