http_response_code（404）在PHP中导致500内部服务器错误[重复]

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I am creating an API application in php.

Part of my application allows for the setting of the http_response_code.
Setting the http_response_code(200) returns a JSON message correctly.
Setting http_response_code(404) is causing a 500 internal server error.
I have created a single php test page that only includes the line http_response_code(404); the 500 error is displaying.

Is there a setting in php that needs to be configured for the http_response_code to work correctly?

I am running Windows Server 2008 R2 with IIS 7. My current version of PHP is 7.

The testing php file just has a sigle line

<?php
http_response_code(404);
?>

web.config file

<location path="" overrideMode="Allow"> <system.webServer> <httpErrors errorMode="Custom" defaultResponseMode="File"> <remove statusCode="500" subStatusCode="-1" /> <error statusCode="500" prefixLanguageFilePath="%SystemDrive%\inetpub\custerr" path="500.htm" responseMode="File" /> </httpErrors> </system.webServer> </location>

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