I popped in some debug points in webuidriver.csp and it looks like the url is still geting stripped post .csp.
@Timothy Leavitt 
I was wondering if we know if this works with apache out of the box?

CUSTRUSH>zw ^XVMC
^XVMC("base")="/isc/studio/usertemplates/gitsourcecontrol/webuidriver.csp///"
^XVMC("handled")=0
^XVMC("namepace")=""
^XVMC("pagePath")=""
^XVMC("url")=""

If i simplify to:

 

location /isc/studio/usertemplates {
    CSP on;
    CSPNSD_pass 127.0.0.1:7038;
}

I get the same message as in the screenshot below and the logs all show 200 so maybe I can KISS and use what you suggested but it still seems like I'm having some difficulty on the back end:

 

2024-11-26 10:27:20 172.18.0.1 - - [26/Nov/2024:18:27:20 +0000] "POST /csp/healthshare/custrush/%25CSP.Broker.cls HTTP/1.1" 200 713 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.ProductionConfig.zen?$NAMESPACE=CUSTRUSH&$NAMESPACE=CUSTRUSH&" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
2024-11-26 10:27:20 172.18.0.1 - - [26/Nov/2024:18:27:20 +0000] "POST /csp/healthshare/custrush/%25CSP.Broker.cls HTTP/1.1" 200 379 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.ProductionConfig.zen?$NAMESPACE=CUSTRUSH&$NAMESPACE=CUSTRUSH&" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
2024-11-26 10:27:20 172.18.0.1 - - [26/Nov/2024:18:27:20 +0000] "POST /csp/healthshare/custrush/%25CSP.Broker.cls HTTP/1.1" 200 363 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.ProductionConfig.zen?$NAMESPACE=CUSTRUSH&$NAMESPACE=CUSTRUSH&" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
2024-11-26 10:27:20 172.18.0.1 - - [26/Nov/2024:18:27:20 +0000] "POST /csp/healthshare/custrush/%25CSP.Broker.cls HTTP/1.1" 200 713 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.ProductionConfig.zen?$NAMESPACE=CUSTRUSH&$NAMESPACE=CUSTRUSH&" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
2024-11-26 10:27:23 172.18.0.1 - - [26/Nov/2024:18:27:23 +0000] "POST /csp/healthshare/custrush/%25CSP.Broker.cls HTTP/1.1" 200 380 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.ProductionConfig.zen?$NAMESPACE=CUSTRUSH&$NAMESPACE=CUSTRUSH&" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
2024-11-26 10:27:23 172.18.0.1 - - [26/Nov/2024:18:27:23 +0000] "POST /csp/healthshare/custrush/%25CSP.Broker.cls HTTP/1.1" 200 380 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.ProductionConfig.zen?$NAMESPACE=CUSTRUSH&$NAMESPACE=CUSTRUSH&" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
2024-11-26 10:27:23 172.18.0.1 - - [26/Nov/2024:18:27:23 +0000] "POST /csp/healthshare/custrush/%25CSP.Broker.cls HTTP/1.1" 200 591 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.ProductionConfig.zen?$NAMESPACE=CUSTRUSH&$NAMESPACE=CUSTRUSH&" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
2024-11-26 10:27:23 172.18.0.1 - - [26/Nov/2024:18:27:23 +0000] "GET /csp/healthshare/custrush/EnsPortal.Dialog.SourceControlManager.zen?$ZEN_POPUP=1&TARGET=%2Fisc%2Fstudio%2Fusertemplates%2Fgitsourcecontrol%2Fwebuidriver.csp%2FCUSTRUSH%2FCUSTRUSHPKG.FoundationProduction.CLS%3FCSPSHARE%3D1%26CSPCHD%3D000000010000NxIbs1CgxCJOtVsUUrplExuBS4wQsqBKgt0G1l%26Project%3D%26Document%3Dlocalhost%253A9092%252FCUSTRUSH%252FCUSTRUSHPKG.FoundationProduction.CLS%26Namespace%3DCUSTRUSH%26User%3D_SYSTEM%26 HTTP/1.1" 200 15250 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.ProductionConfig.zen?$NAMESPACE=CUSTRUSH&$NAMESPACE=CUSTRUSH&" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
2024-11-26 10:27:24 172.18.0.1 - - [26/Nov/2024:18:27:24 +0000] "POST /csp/healthshare/custrush/%25CSP.Broker.cls HTTP/1.1" 200 385 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.ProductionConfig.zen?$NAMESPACE=CUSTRUSH&$NAMESPACE=CUSTRUSH&" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
2024-11-26 10:27:24 172.18.0.1 - - [26/Nov/2024:18:27:24 +0000] "POST /csp/healthshare/custrush/%25CSP.Broker.cls HTTP/1.1" 200 363 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.ProductionConfig.zen?$NAMESPACE=CUSTRUSH&$NAMESPACE=CUSTRUSH&" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
2024-11-26 10:27:24 172.18.0.1 - - [26/Nov/2024:18:27:24 +0000] "POST /csp/healthshare/custrush/%25CSP.Broker.cls HTTP/1.1" 200 379 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.ProductionConfig.zen?$NAMESPACE=CUSTRUSH&$NAMESPACE=CUSTRUSH&" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
2024-11-26 10:27:24 172.18.0.1 - - [26/Nov/2024:18:27:24 +0000] "POST /csp/healthshare/custrush/%25CSP.Broker.cls HTTP/1.1" 200 363 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.ProductionConfig.zen?$NAMESPACE=CUSTRUSH&$NAMESPACE=CUSTRUSH&" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"
2024-11-26 10:27:26 172.18.0.1 - - [26/Nov/2024:18:27:25 +0000] "GET /isc/studio/usertemplates/gitsourcecontrol/webuidriver.csp/CUSTRUSH/CUSTRUSHPKG.FoundationProduction.CLS?CSPSHARE=1&Project=&Document=localhost%3A9092%2FCUSTRUSH%2FCUSTRUSHPKG.FoundationProduction.CLS&Namespace=CUSTRUSH&User=_SYSTEM&CSPCHD=000000010000NxIbs1CgxCJOtVsUUrplExuBS4wQsqBKgt0G1l HTTP/1.1" 200 23 "http://localhost:9092/csp/healthshare/custrush/EnsPortal.Dialog.SourceControlManager.zen?$ZEN_POPUP=1&TARGET=%2Fisc%2Fstudio%2Fusertemplates%2Fgitsourcecontrol%2Fwebuidriver.csp%2FCUSTRUSH%2FCUSTRUSHPKG.FoundationProduction.CLS%3FCSPSHARE%3D1%26CSPCHD%3D000000010000NxIbs1CgxCJOtVsUUrplExuBS4wQsqBKgt0G1l%26Project%3D%26Document%3Dlocalhost%253A9092%252FCUSTRUSH%252FCUSTRUSHPKG.FoundationProduction.CLS%26Namespace%3DCUSTRUSH%26User%3D_SYSTEM%26" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36"