[core] Send 404 if file does not exist

fix #134

src/api/exception.filter.ts

@@ -23,16 +23,42 @@ export function serializeError(err: unknown) {
 
 @Catch()
 export class AllExceptionsFilter implements ExceptionFilter {
-  catch(exception: HttpException | Error, host: ArgumentsHost): void {
+  catch(exception: any | Error, host: ArgumentsHost): void {
     const ctx = host.switchToHttp();
     const response = ctx.getResponse<Response>();
     const request = ctx.getRequest<Request>();
 
+    /**
+     * If file not found - we get weird 500 error
+     * So we convert that exception manually to 404 and send appropriate JSON response
+     * @issue https://github.com/devlikeapro/whatsapp-http-api/issues/134
+     * @solution https://github.com/nestjs/serve-static/issues/139#issuecomment-612429557
+     */
+    if (exception.code === 'ENOENT') {
+      response.status(HttpStatus.NOT_FOUND).json({
+        error: {
+          code: 404,
+          key: 'FILE_NOT_FOUND',
+          message: 'File not found',
+          details: 'File not found or no longer available',
+        },
+      });
+      response.send();
+      return;
+    }
+
+    /**
+     * If it's HttpException - pass it as is
+     */
     if (exception instanceof HttpException) {
       response.status(exception.getStatus()).json(exception.getResponse());
       return;
     }
 
+    /**
+     * If it's not HttpException - pass it as 500 error
+     * And send JSON response with error details
+     */
     const httpStatus = HttpStatus.INTERNAL_SERVER_ERROR;
     response.status(httpStatus).json({
       statusCode: httpStatus,

src/main.ts

@@ -7,7 +7,6 @@ import { AppModuleCore } from './core/app.module.core';
 import { SwaggerModuleCore } from './core/swagger.module.core';
 import { getWAHAVersion, VERSION, WAHAVersion } from './version';
 import { WAHA_WEBHOOKS } from './structures/webhooks.dto';
-import { LogLevel } from '@nestjs/common';
 import { getLogLevels } from './helpers';
 
 async function loadModules(): Promise<