Caching moved to CDN (#76)

* Add GCS proxy endpoint for serving report files and MIME type mapping

* Add IAM member for service account storage object viewer in Google Cloud Storage

* chore: update @google-cloud/functions-framework dependency to allow minor version upgrades

* format Terraform

* feat: add CDN controller and update API paths for versions and reports

* Apply suggestion from @Copilot

Co-authored-by: Copilot <[email protected]>

* feat: update GCS proxy endpoint to serve static files instead of reports

* feat: remove unused IAM member for storage object viewer

* feat: add tests for static file retrieval and error handling in API routes

* feat: update API routes to serve static files instead of reports

* feat: update API routes and MIME type handling for static files

* feat: remove cache management endpoints and related tests from API

* feat: update Node.js version requirement in README

* Update src/__tests__/routes.test.js

Co-authored-by: Copilot <[email protected]>

* Update src/__tests__/routes.test.js

Co-authored-by: Copilot <[email protected]>

* fix

---------

Co-authored-by: Copilot <[email protected]>

Author: max-ostapenko

README.md

@@ -6,7 +6,7 @@ This is an HTTP Archive Reporting API that provides reporting data via various e
 
 ### Prerequisites
 
-- Node.js 18+
+- Node.js 22+
 - npm
 - Google Cloud account with necessary permissions
 - Set environment variables:
@@ -30,7 +30,6 @@ The API will be available at <http://localhost:3000>
 - **Cache Headers**: 6-hour cache control for static data
 - **Health Check**: GET `/` returns health status
 - **RESTful API**: All endpoints follow REST conventions
-- **Backend caching**: Some responses are cached on the backend for 1 hours to improve latency
 
 ### `GET /`
 
@@ -501,51 +500,6 @@ Returns a JSON object with the following schema:
 ]
 ```
 
-### `GET /cache-stats`
-
-Provides statistics about the API's cache.
-
-```bash
-curl --request GET \
-  --url 'https://{{HOST}}/v1/cache-stats'
-```
-
-Returns a JSON object with the following schema:
-
-```json
-{
-    "cache_hits": 12345,
-    "cache_misses": 6789,
-    "last_cleared": "2023-10-01T12:00:00Z"
-}
-```
-
-### `POST /v1/cache-reset`
-
-Resets all caches in the API. This endpoint requires a POST request.
-
-```bash
-curl --request POST \
-  --url 'https://{{HOST}}/v1/cache-reset'
-```
-
-Returns a JSON object with the following schema:
-
-```json
-{
-    "success": true,
-    "message": "All caches have been reset",
-    "before": {
-        "queryCache": 150,
-        "dateCache": 12
-    },
-    "after": {
-        "queryCache": 0,
-        "dateCache": 0
-    }
-}
-```
-
 ## Testing
 
 ```bash
@@ -667,34 +621,4 @@ Response:
 }
 ```
 
-## Cache Stats Private Endpoint
-
-The Cache Stats private endpoint provides information about the API's cache performance, including cache hits, misses, and the last time the cache was cleared. This endpoint is useful for monitoring and debugging cache behavior.
-
-```bash
-curl "https://tech-report-api-dev-226352634162.us-central1.run.app/v1/cache-stats" \
-  -H "Authorization: bearer $(gcloud auth print-identity-token)"
-```
-
-Returns a JSON object with the following schema:
 
-```json
-{
-    "queryCache": {
-        "total": 3220,
-        "valid": 2437,
-        "expired": 783,
-        "ttl": 3600000
-    },
-    "dateCache": {
-        "total": 4,
-        "valid": 4,
-        "expired": 0,
-        "ttl": 3600000
-    },
-    "config": {
-        "maxCacheSize": 5000,
-        "cleanupStrategy": "size-based-lru"
-    }
-}
-```