fix request default endpoints from serde context being overridden

Author: AllanZhengYP

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpBindingProtocolGenerator.java

@@ -228,7 +228,6 @@ private void generateOperationSerializer(
             }
 
             writer.openBlock("return new $T({", "});", requestType, () -> {
-                writer.write("...context.endpoint,");
                 if (hasHostPrefix) {
                     writer.write("hostname: resolvedHostname,");
                 }
@@ -248,6 +247,7 @@ private void generateOperationSerializer(
                 }
                 // Always set the body,
                 writer.write("body: body,");
+                writer.write("...context.endpoint,");
             });
         });
 

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/integration/HttpRpcProtocolGenerator.java

@@ -108,11 +108,11 @@ public void generateSharedComponents(GenerationContext context) {
                        + "  body: any,\n"
                        + "): $T => {", "};", requestType, () -> {
             writer.openBlock("const contents: any = {", "};", () -> {
-                writer.write("...context.endpoint,");
                 writer.write("protocol: \"https\",");
                 writer.write("method: \"POST\",");
                 writer.write("path: path,");
                 writer.write("headers: headers,");
+                writer.write("...context.endpoint,");
             });
             writer.openBlock("if (resolvedHostname !== undefined) {", "}", () -> {
                 writer.write("contents.hostname = resolvedHostname;");