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knative - inferred Content-Type from Non-JSON body
If a content-type header is not declared in the action result’s headers, the body is interpreted as application/json
for non-string values, and text/html
otherwise. When the content-type
is defined, the runtime should determine if the response is binary data or plain text and decode the string using a base64 decoder as needed. If the body fail to decode correctly, an error must return to the caller.