What is the purpose and usage of ASP.NET Handler (.ashx) files? [duplicate]

This question already has answers here: What is a Generic Handler in asp.net and its use? (5 answers) 开发者_开发百科 Closed 9 years ago.

What is the purpose of ASP.NET Handler (.ashx files) and how best can they be used?

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An ASHX handler allows you a discrete http handler without the overhead of processing a page request (an ASPX file).