feat(api-server): allow CORS requests (#48)

packages/api-server/src/api-server.ts

@@ -148,7 +148,11 @@ export class NanotronApiServer {
     this.httpServer.on('clientError', this.handleClientError_);
 
     if (this.config_.healthRoute) {
-      this._defineHealthRoute();
+      this.defineHealthRoute_();
+    }
+
+    if (this.config_.allowAllOrigin === true) {
+      this.defineCorsRoute_();
     }
   }
 
@@ -253,6 +257,10 @@ export class NanotronApiServer {
 
     const connection = new NanotronClientRequest(url, nativeClientRequest, nativeServerResponse, routeOption);
 
+    if (this.config_.allowAllOrigin === true) {
+      connection.serverResponse.headers['access-control-allow-origin'] = '*';
+    }
+
     if (routeOption === null) {
       connection.serverResponse.statusCode = HttpStatusCodes.Error_Client_404_Not_Found;
       connection.serverResponse.replyError();
@@ -284,7 +292,9 @@ export class NanotronApiServer {
     // TODO: handled open remained connections.
   }
 
-  protected _defineHealthRoute(): void {
+  protected defineHealthRoute_(): void {
+    this.logger_.logMethod?.('defineHealthRoute_');
+
     this.defineRoute({
       method: 'GET',
       url: '/health',
@@ -297,4 +307,22 @@ export class NanotronApiServer {
       },
     });
   }
+
+  protected defineCorsRoute_(): void {
+    this.logger_.logMethod?.('defineCorsRoute_');
+
+    this.defineRoute({
+      method: 'OPTIONS',
+      matchType: 'startsWith',
+      url: '/',
+      handler: function () {
+        const res = this.serverResponse.raw_;
+        res.statusCode = HttpStatusCodes.Success_204_No_Content;
+        res.setHeader('access-control-allow-origin', '*');
+        res.setHeader('access-control-allow-methods', '*');
+        res.setHeader('access-control-allow-headers', '*');
+        res.end();
+      },
+    });
+  }
 }

yarn.lock

@@ -2240,16 +2240,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/node@npm:*":
-  version: 22.8.6
-  resolution: "@types/node@npm:22.8.6"
-  dependencies:
-    undici-types: "npm:~6.19.8"
-  checksum: 10c0/d3a11f2549234a91a4c5d0ff35ab4bdcb7ba34db4d3f1d189be39b8bd41c19aac98d117150a95a9c5a9d45b1014135477ea240b2b8317c86ae3d3cf1c3b3f8f4
-  languageName: node
-  linkType: hard
-
-"@types/node@npm:^22.9.0":
+"@types/node@npm:*, @types/node@npm:^22.9.0":
   version: 22.9.0
   resolution: "@types/node@npm:22.9.0"
   dependencies:
@@ -2943,9 +2934,9 @@ __metadata:
   linkType: hard
 
 "caniuse-lite@npm:^1.0.30001669":
-  version: 1.0.30001676
-  resolution: "caniuse-lite@npm:1.0.30001676"
-  checksum: 10c0/53d310d76b5282947c99638a65d7534ac28a80aae1920de085a616ec8ad603358fad67cebacfc0452b1efdea12cce24fd37a50a712d074986b4962110e87d82b
+  version: 1.0.30001678
+  resolution: "caniuse-lite@npm:1.0.30001678"
+  checksum: 10c0/3209cc0f0b9683514916bed676d8f7965cae7faccaccb90f97c11fbdee32cd3f2f3b9cfec388ef400476299c3dd496fb1f8734c31c6199c4799b42813391517f
   languageName: node
   linkType: hard
 
@@ -3299,13 +3290,13 @@ __metadata:
   linkType: hard
 
 "cross-spawn@npm:^7.0.0, cross-spawn@npm:^7.0.2, cross-spawn@npm:^7.0.3":
-  version: 7.0.3
-  resolution: "cross-spawn@npm:7.0.3"
+  version: 7.0.4
+  resolution: "cross-spawn@npm:7.0.4"
   dependencies:
     path-key: "npm:^3.1.0"
     shebang-command: "npm:^2.0.0"
     which: "npm:^2.0.1"
-  checksum: 10c0/5738c312387081c98d69c98e105b6327b069197f864a60593245d64c8089c8a0a744e16349281210d56835bb9274130d825a78b2ad6853ca13cfbeffc0c31750
+  checksum: 10c0/04f6c70dcbdd156f53073f13730f71160dabb91c8dfbdb24a873f4580ad7ca4b73c062ddfaaa2ba46d0dac433856d0cc0a07ff7173cd5404fefde952e87c9dbf
   languageName: node
   linkType: hard
 
@@ -3529,9 +3520,9 @@ __metadata:
   linkType: hard
 
 "electron-to-chromium@npm:^1.5.41":
-  version: 1.5.50
-  resolution: "electron-to-chromium@npm:1.5.50"
-  checksum: 10c0/8b77b18ae833bfe2173e346ac33b8d66b5b5acf0cf5de65df9799f4d482334c938aa0950e4d01391d5fab8994f46c0e9059f4517843e7b8d861f9b0c49eb4c5d
+  version: 1.5.52
+  resolution: "electron-to-chromium@npm:1.5.52"
+  checksum: 10c0/1c85a5710ad21758780b8e067d5f63ed00416dbe93f64bd8937dbfb4ed98cf93d80c471a30daed439cb91a00ff4942ea2628e00a69d56639cc7070e9e8ab2694
   languageName: node
   linkType: hard