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@tall-state-52885 i used aws.apigatewayv2 and not awsx.apigateway so YMMV but in my handler function i've seen both base64 and non-base64 encoded request.body which seems to be driven by clients and not api gateway itself. in my handler function i just optionally decode when the body is base64 encoded. e.g.:

func handler(ctx context.Context,
	request events.APIGatewayV2HTTPRequest) (events.APIGatewayV2HTTPResponse,
	error) {

	var err error

	errorResponse := events.APIGatewayV2HTTPResponse{
		StatusCode:      500,
		Body:            "",
		IsBase64Encoded: false,
	}

	body := request.Body
	if request.IsBase64Encoded {
		decodedBody, err := base64.StdEncoding.DecodeString(request.Body)
		if err != nil {
			log.Printf("handler: Failed to base64 decode: %v", err)
			return errorResponse, err
		}
		body = string(decodedBody)
	}

        .....