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What are HTTP Headers?
HTTP stands for "Hypertext Transfer Protocol". The entire World Wide Web uses this protocol. It was established in the early 1990's. Almost everything you see in your browser is transmitted to your computer over HTTP. For example, when you accessed this Get HTTP Headers Tool page, your browser probably have sent over 40 HTTP requests and received HTTP responses for each.
HTTP headers are the core part of these HTTP requests and responses, and they carry information about the client browser, the requested page, the server and more.
How the "Get HTTP Headers Tool" works?
This tool allow you to inspect the HTTP headers that the web server returns when requesting a URL.
In other words, the HTTP headers allow the client and the server to pass additional information with the request or the response. An HTTP header consists of its case-insensitive name followed by a colon '
:', then by its value (without line breaks). Leading white space before the value is ignored.
You may read more about HTTP Headers Tools at Mozilla Developer.