AWS API Gateway Binary output without Accept header

问题

According to http://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-payload-encodings.html

If contentHandling is not defined, and if the Content-Type header of the response and the Accept header of the original request match an entry of the binaryMediaTypes list, API Gateway passes through the body. This occurs when the Content-Type header and the Accept header are the same; otherwise, API Gateway converts the response body to the type specified in the Accept header.

I can't make the original request to send the Accept header. How can I make my AWS API Gateway to return in binary format? (image/jpeg). Because the image I'm sending back from s3 gets converted to text in the last stage (because the original request lacks of the Accept: image/jpeg header).

回答1:

Set the 'Content handling' in your integration response to 'Convert to binary'. When Convert to binary is set in the integration response, the Content-Type API Gateway response header is '*/*' so you need to create a header mapping in the integration response for Content-Type, mapped to integration.response.header.Content-Type. This will ensure that the API Gateway response includes the same Content-Type value the backend passed in it's response to API Gateway.

Just to be clear, here is a summary of the required settings.

Integration Response: