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 delivier the image.
Unfortunately I wasn't able to alter the Referer item (translated to English):
"Attempt to use a forbidden header was rejected: Referer"
In 3.x you can use esriRequest.setRequestPreCallback()
esri/request | API Reference | ArcGIS API for JavaScript 3.17
This will let you modify the request before it is sent.
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