Title: Detect.php causing 404 error in Chrome DevTools
Last modified: November 8, 2018

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# Detect.php causing 404 error in Chrome DevTools

 *  [thematthewmullins](https://wordpress.org/support/users/thematthewmullins/)
 * (@thematthewmullins)
 * [7 years, 6 months ago](https://wordpress.org/support/topic/detect-php-causing-404-error-in-chrome-devtools/)
 * Hello,
 * We are currently experiencing a 404 error in Chrome’s DevTools for the detect.
   php file in the whichbrowser library. Was wondering what could be causing this
   as it is being loaded on every page on our domain and not just the pages with
   gravity forms. Could we do something to fix this from being reported as a 404?
   It also being reported in Google Search Console as a 403 error and that it is
   blocked by robots.txt, which is odd because when I paste the file path into the
   GSC robots.txt tester it returns a status of ‘Allowed’.
 * Thank you for your help,
 * Matthew Mullins
    CNCMachines.Net
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fdetect-php-causing-404-error-in-chrome-devtools%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

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 * 0 replies
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 * Last reply from: [thematthewmullins](https://wordpress.org/support/users/thematthewmullins/)
 * Last activity: [7 years, 6 months ago](https://wordpress.org/support/topic/detect-php-causing-404-error-in-chrome-devtools/)
 * Status: not resolved