add comma spacing for content-encoding header

Author: kuhe

.changeset/proud-bugs-deny.md

@@ -0,0 +1,5 @@
+---
+"@smithy/middleware-compression": patch
+---
+
+comma spacing

packages/middleware-compression/src/compressionMiddleware.spec.ts

@@ -160,7 +160,7 @@ describe(compressionMiddleware.name, () => {
             body: mockCompressedBody,
             headers: {
               ...mockArgs.request.headers,
-              "content-encoding": [mockExistingContentEncoding, "gzip"].join(","),
+              "content-encoding": [mockExistingContentEncoding, "gzip"].join(", "),
             },
           },
         });

packages/middleware-compression/src/compressionMiddleware.ts

@@ -82,7 +82,7 @@ export const compressionMiddleware =
           if (headers["content-encoding"]) {
             updatedHeaders = {
               ...headers,
-              "content-encoding": `${headers["content-encoding"]},${algorithm}`,
+              "content-encoding": `${headers["content-encoding"]}, ${algorithm}`,
             };
           } else {
             updatedHeaders = { ...headers, "content-encoding": algorithm };

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/HttpProtocolTestGenerator.java

@@ -92,9 +92,6 @@ public final class HttpProtocolTestGenerator implements Runnable {
 
     private static final Logger LOGGER = Logger.getLogger(HttpProtocolTestGenerator.class.getName());
     private static final String TEST_CASE_FILE_TEMPLATE = "test/functional/%s.spec.ts";
-    private static final Set<String> IGNORE_COMMA_SPACING = SetUtils.of(
-        "content-encoding"
-    );
 
     private final TypeScriptSettings settings;
     private final Model model;
@@ -521,17 +518,7 @@ private void writeHttpHeaderAssertions(HttpMessageTestCase testCase) {
         testCase.getHeaders().forEach((header, value) -> {
             header = header.toLowerCase();
             writer.write("expect(r.headers[$S]).toBeDefined();", header);
-            if (IGNORE_COMMA_SPACING.contains(header) && value.contains(",")) {
-                writer.write("""
-                    expect(
-                      r.headers[$S].replaceAll(", ", ",")
-                    ).toBe(
-                      $S.replaceAll(", ", ",")
-                    );
-                    """, header, value);
-            } else {
-                writer.write("expect(r.headers[$S]).toBe($S);", header, value);
-            }
+            writer.write("expect(r.headers[$S]).toBe($S);", header, value);
         });
         writer.write("");
     }