change: Make header capitalization consistent.

src/ldp/http/metadata/LinkRelMetadataWriter.ts

@@ -24,7 +24,7 @@ export class LinkRelMetadataWriter extends MetadataWriter {
       const values = input.metadata.getAll(key).map((term): string => `<${term.value}>; rel="${this.linkRelMap[key]}"`);
       if (values.length > 0) {
         this.logger.debug(`Adding Link header ${values}`);
-        addHeader(input.response, 'link', values);
+        addHeader(input.response, 'Link', values);
       }
     }
   }

src/server/middleware/WebSocketAdvertiser.ts

@@ -16,6 +16,6 @@ export class WebSocketAdvertiser extends HttpHandler {
   }
 
   public async handle({ response }: { response: HttpResponse }): Promise<void> {
-    addHeader(response, 'updates-via', this.socketUrl);
+    addHeader(response, 'Updates-Via', this.socketUrl);
   }
 }