Xojo Web + proxy issue caused by X-Requested-With

Targets Web
1

I have a Xojo Web app that works fine on most networks, but fails behind a customer’s corporate proxy (ProxySG / Blue Coat).

We traced the issue to X-Requested-With: XMLHttpRequest being added to Xojo’s client requests (via jQuery), which causes the browser to require a CORS preflight. The proxy appears to block or mishandle that preflight.

Removing X-Requested-With at the XHR level seems to resolves the issue and eliminates the preflight.

Is this a known issue with strict proxies?

Is there a better way to handle this?

Thank you for your help!

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