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Why am I seeing requests sent through pcc.ashx when they shouldn’t be?
The default option for the imageHandlerUrl is pcc.ashx so if, for instance, you misspelled imageHandlerUrl or in some other way do not have the setting properly implemented, you will see requests sent through pcc.ashx.
imageHandlerUrl
This has been seen when trying to set up the pas-service reverse proxy redirect for Prizm Application Services (PAS).
A sample implementation of this setting can be found in the viewer.js around line 288.
viewer.js
options.imageHandlerUrl = options.imageHandlerUrl || "../pcc.ashx";