Verified that ALB does as you say, 502 returned with json {"statusCode": 200, "body": null} but expect 200 returned when json is {"statusCode": 200}. The go struct isn't actually able to produce this, since the type is string rather than *string.

So... I think it's OK to represent in this model that null should never be written for this integration. As far as I can tell in my testing it's also harmless to drop the empty string body, ALB behaves the same way.

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@@           Coverage Diff           @@
##             main     #408   +/-   ##
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  Coverage   71.63%   71.63%           
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  Files          19       19           
  Lines        1040     1040           
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  Hits          745      745           
  Misses        228      228           
  Partials       67       67           

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Verified that ALB does as you say, 502 returned with json {"statusCode": 200, "body": null} but expect 200 returned when json is {"statusCode": 200}. The go struct isn't actually able to produce this, since the type is string rather than *string.

So... I think it's OK to represent in this model that null should never be written for this integration. As far as I can tell in my testing it's also harmless to drop the empty string body, ALB behaves the same way.

I was referencing this issue recently in a discussion, and realized that the change modified the request, not the response - so the issue described of a 5xx on the response path still exists.

🤦 You're right.