codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/integration/HttpBindingProtocolGenerator.java [253:267]:
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            writer.addUseImports(SmithyGoDependency.SMITHY_HTTP_BINDING);

            writer.write(goTemplate("""
                    _, span := $T(ctx, "OperationSerializer")
                    endTimer := startMetricTimer(ctx, "client.call.serialization_duration")
                    defer endTimer()
                    defer span.End()
                    """, SMITHY_TRACING.func("StartSpan")));

            // cast input request to smithy transport type, check for failures
            writer.write("request, ok := in.Request.($P)", requestType);
            writer.openBlock("if !ok {", "}", () -> {
                writer.write("return out, metadata, "
                        + "&smithy.SerializationError{Err: fmt.Errorf(\"unknown transport type %T\", in.Request)}"
                );
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codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/integration/HttpRpcProtocolGenerator.java [148:166]:
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            writer.addUseImports(SmithyGoDependency.SMITHY_HTTP_BINDING);

            writer.write(goTemplate("""
                    _, span := $T(ctx, "OperationSerializer")
                    endTimer := startMetricTimer(ctx, "client.call.serialization_duration")
                    defer endTimer()
                    defer span.End()
                    """, SMITHY_TRACING.func("StartSpan")));

            // TODO: refactor the http binding encoder to be split up into its component parts
            // This would allow most of this shared code to be split off into its own function
            // to reduce duplication, and potentially allowing it to be a static function.
            // For example, a HeaderBag type could handle all the headers.
            // Cast the input request to the transport request type and check for errors.
            writer.write("request, ok := in.Request.($P)", requestType);
            writer.openBlock("if !ok {", "}", () -> {
                writer.write("return out, metadata, "
                             + "&smithy.SerializationError{Err: fmt.Errorf(\"unknown transport type %T\", in.Request)}"
                );
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