How to update an XML file without reloading the page

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Good afternoon, I am creating an application that loads functions based on the information of a given XML file. However, once I save a new function via php, when I go to do a Xhttprequest in javascript the code remains the same. I have tried using requestHeader("cache-control", "no-cache") but am still having problems. Does anyone know a solution to my problem? I’m using cache-control improperly? Any help is appreciated

EDIT: Resolved as in the answer, I found out what I was doing wrong.

javascript cache xmlhttprequest

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Cache-control cannot be used in requests, only in Sponses, you can create a php file that returns your xml file every time it is called. See the code below:

$xmlfile = file_get_contents ( "myfile.xml" );
header ( "Cache-Control: no-cache" );
header ( "Pragma: no-cache" );
header ( "Content-type: text/xml" );
echo $xmlfile;

This way you can return the file and every time a new request is made, no cache will be used.

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