fix(lambda-tiler): Return 204 non content for empty 404 vector tile. (#…

…2391)

* Return 204 non content for empty vector tile.

* move the no content response into util

* Fix the naming

packages/lambda-tiler/src/routes/tile.xyz.vector.ts

@@ -3,7 +3,7 @@ import { GoogleTms, VectorFormat } from '@basemaps/geo';
 import { HttpHeader, LambdaHttpRequest, LambdaHttpResponse } from '@linzjs/lambda';
 import { isGzip } from '../util/cotar.serve.js';
 import { Etag } from '../util/etag.js';
-import { NotFound, NotModified } from '../util/response.js';
+import { NoContent, NotFound, NotModified } from '../util/response.js';
 import { CoSources } from '../util/source.cache.js';
 import { TileXyz } from '../util/validate.js';
 
@@ -34,7 +34,7 @@ export const tileXyzVector = {
 
     req.timer.start('cotar:tile');
     const tile = await cotar.get(tilePath);
-    if (tile == null) return NotFound();
+    if (tile == null) return NoContent();
     req.timer.end('cotar:tile');
 
     const tileBuffer = Buffer.from(tile);

packages/lambda-tiler/src/util/response.ts

@@ -2,3 +2,4 @@ import { LambdaHttpResponse } from '@linzjs/lambda';
 
 export const NotFound = (): LambdaHttpResponse => new LambdaHttpResponse(404, 'Not Found');
 export const NotModified = (): LambdaHttpResponse => new LambdaHttpResponse(304, 'Not modified');
+export const NoContent = (): LambdaHttpResponse => new LambdaHttpResponse(204, 'No Content');