vCD HTML5 UI - Editing rights bundle fails with " Unexpected token < in JSON at position 0 "

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If you have come across an error message similar to the below in the vCD HTML5 UI, the issue is due to the large payload on the load balancer

Unexpected token < in JSON at position 0



Browser console has the below error :

Failed to load resource: the server responded with a status of 502 (Bad Gateway)
service-provider.bundle.js:1 Unsupported REST exception RightsComponent#rights SyntaxError: Unexpected token < in JSON at position 0
  at JSON.parse (<anonymous>)
  at CatchSubscriber.selector (service-provider.bundle.js:1)
  at CatchSubscriber.error (vendor.bundle.js:991)
  at XMLHttpRequest.s (vendor.bundle.js:830)
  at ZoneDelegate.invokeTask (vendor.bundle.js:1040)
  at Object.onInvokeTask (vendor.bundle.js:457)
  at ZoneDelegate.invokeTask (vendor.bundle.js:1040)
  at Zone.runTask (vendor.bundle.js:1040)
  at ZoneTask.invokeTask [as invoke] (vendor.bundle.js:1040)
  at p (vendor.bundle.js:1012)
Action Plan:

 In my case, I am using NSX Edge Load balancer

 PUT https://<NSX-IP>/api/4.0/edges/<edge-id>/systemcontrol/config
<systemControl>
 <property>lb.global.tune.http.maxhdr=1024</property>
 <property>lb.global.tune.bufsize=1048576</property>
 <property>lb.global.tune.maxrewrite=16384</property>
</systemControl>

 Sending the above call increases Edge LB buffer size above the default 32 KB. This will fix this issue. 

 Hope this helps :) 

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