topic Re: Add custom headers to layer requests in ArcGIS JavaScript Maps SDK Questions https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/add-custom-headers-to-layer-requests/m-p/581404#M54250 <HTML><HEAD></HEAD><BODY><P>Unfortunately I wasn't able to alter the Referer item (translated to English):</P><P><SPAN class="" lang="en"><SPAN class="">"Attempt to use a forbidden header was rejected: Referer</SPAN></SPAN>"</P></BODY></HTML> Tue, 25 Sep 2018 12:57:30 GMT RiccardoKlinger2 2018-09-25T12:57:30Z Add custom headers to layer requests https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/add-custom-headers-to-layer-requests/m-p/581402#M54248 <HTML><HEAD></HEAD><BODY><P>Is it possible to add custom HTTP headers to every layer request (p.e. WMTSLayer)? I'd like to add the referer header because otherwise the WMTS Service doesn't&nbsp; delivier the image.</P></BODY></HTML> Mon, 08 Aug 2016 11:05:56 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/add-custom-headers-to-layer-requests/m-p/581402#M54248 LukasKalt 2016-08-08T11:05:56Z Re: Add custom headers to layer requests https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/add-custom-headers-to-layer-requests/m-p/581403#M54249 <HTML><HEAD></HEAD><BODY><P>In 3.x you can use <SPAN style="font-family: 'courier new', courier;">esriRequest.setRequestPreCallback()</SPAN></P><P></P><P><A href="https://developers.arcgis.com/javascript/3/jsapi/esri.request-amd.html#esrirequest.setrequestprecallback" title="https://developers.arcgis.com/javascript/3/jsapi/esri.request-amd.html#esrirequest.setrequestprecallback">esri/request | API Reference | ArcGIS API for JavaScript 3.17</A></P><P></P><P>This will let you modify the request before it is sent.</P></BODY></HTML> Mon, 08 Aug 2016 15:05:46 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/add-custom-headers-to-layer-requests/m-p/581403#M54249 ReneRubalcava 2016-08-08T15:05:46Z Re: Add custom headers to layer requests https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/add-custom-headers-to-layer-requests/m-p/581404#M54250 <HTML><HEAD></HEAD><BODY><P>Unfortunately I wasn't able to alter the Referer item (translated to English):</P><P><SPAN class="" lang="en"><SPAN class="">"Attempt to use a forbidden header was rejected: Referer</SPAN></SPAN>"</P></BODY></HTML> Tue, 25 Sep 2018 12:57:30 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/add-custom-headers-to-layer-requests/m-p/581404#M54250 RiccardoKlinger2 2018-09-25T12:57:30Z