How to Read the Value of a HTTP Header?

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To read the value of a HTTP header, you need to use a server-side technology like ASP, Java Servlet, JSP, Perl, PHP, etc.

For example, to read the user-agent header value and store it into a variable uaheader with JSP, use the following code:

String uaheader = request.getHeader("user-agent");

For ASP (VBScript), use the following code to read the user-agent header value:

dim uaheader
uaheader = Request.ServerVariables("http_user_agent")

For ASP (JScript), use the following code to read the user-agent header value:

var uaheader = Request.ServerVariables("http_user_agent");

For PHP, use the following code to read the user-agent header value:

$uaheader = $_SERVER["HTTP_USER_AGENT"];

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