I'm having issues with a proxy/CDN (which I have no control over) blocking ExportMap requests containing compound definitions, e.g. amount >= 1000 and amount <= 10000 and program in ('abc','xyz').
In talking with tech support the requests as getting blocked as they are seen as possible SQL injection. One suggestion was to encode the >= and <=, like
amount ≥ 1000 and amount ≤ 10000 and program in ('abc','xyz').
In testing ArcGIS Server always returns blank images using the encoded symbols, so this does not seem to be an option.
Has anyone else had issues similar to this or have suggestions?