diff --git a/src/api/items.ts b/src/api/items.ts
index d6fe9b8..19e9a0b 100644
--- a/src/api/items.ts
+++ b/src/api/items.ts
@@ -1,24 +1,24 @@
 import Client from "./interface";
 import Key from "./keys";
 import { request } from 'https';
+import printf from "../fmt/printf";
 
 export default class CarrefourItems implements Client {
 
-	host: string;
-	uri: string;
-	token: string;
-	clients: any[];
-
-	static get key(){ return Key.get("carrefour"); }
-
+	static host: string = 'api.fr.carrefour.io';
+	static uri: string  = '/v1/openapi/items';
+	static get key(){ return Key.get('carrefour'); }
 
 	constructor(){
-		this.host = "api.fr.carrefour.io";
-		this.uri = "/v1/openapi/items";
+		printf('+ carrefour items \t-> ');
 
 		// check key
-		if( !CarrefourItems.key['app_id'] || !CarrefourItems.key['app_secret'] )
+		if( !CarrefourItems.key['app_id'] || !CarrefourItems.key['app_secret'] ){
+			printf('error\n');
 			throw new Error("The 'carrefour' key must feature 2 fields: ['app_id', 'app_secret']");
+		}
+
+		printf('loaded\n');
 	}
 
 
@@ -33,8 +33,8 @@ export default class CarrefourItems implements Client {
 		})
 
 		let reqopt = {
-			hostname: this.host,
-			path:     this.uri,
+			hostname: CarrefourItems.host,
+			path:     CarrefourItems.uri,
 			port:     443,
 			method:   'POST',
 			headers: {
@@ -48,6 +48,8 @@ export default class CarrefourItems implements Client {
 
 		return new Promise<object>( (resolve, reject) => {
 
+			printf('  + carrefour item search  | ');
+
 			let req = request(reqopt, (res) => {
 
 				let chunks = [];
diff --git a/src/fmt/printf.ts b/src/fmt/printf.ts
new file mode 100644
index 0000000..878b610
--- /dev/null
+++ b/src/fmt/printf.ts
@@ -0,0 +1,7 @@
+import { format } from "util";
+
+export default function printf(fmt:string, ...options:any){
+
+	process.stdout.write( format(fmt, ...options) );
+
+}
\ No newline at end of file
diff --git a/src/main.ts b/src/main.ts
index 5a3173c..6d4dcf0 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -2,11 +2,11 @@ import { createServer } from 'http'
 import { Socket } from 'net';
 import Mixer from './mixer'
 import CarrefourItems from './api/items';
+import printf from './fmt/printf';
 
 
 const mixer: Mixer = new Mixer();
 
-
 // 1. build server
 const server = createServer(mixer.http_handler.bind(mixer));
 
@@ -17,4 +17,4 @@ server.on('clientError', (err: Error, sock: Socket) => {
 
 // 3. listen on given port
 server.listen(8000);
-console.log('+ listen 8080')
\ No newline at end of file
+printf('+ listen 8080\n')
\ No newline at end of file
diff --git a/src/mixer.ts b/src/mixer.ts
index 365c1f0..4a20ab8 100644
--- a/src/mixer.ts
+++ b/src/mixer.ts
@@ -3,15 +3,16 @@ import CarrefourItems from "./api/items";
 import { parse as parseURL, UrlWithParsedQuery } from "url";
 import { ParsedUrlQuery } from "querystring";
 import Client from "./api/interface";
+import printf from "./fmt/printf";
 
 export default class Mixer {
 
-	static valid_urls = ["/", "/oauth"];
+	static valid_urls = ["/"];
 
 	chain: Client[] = [new CarrefourItems()];
 
 	constructor(){
-		console.log("+ mixer init");
+		printf('+ mixer \t\t-> loaded\n\n');
 	}
 
 	http_handler(req: IncomingMessage, res: ServerResponse){
@@ -29,51 +30,42 @@ export default class Mixer {
 			return;
 		}
 
-		// if query
-		if( urlObj.pathname == "/" ){
-			let err:Error = this.query(req, res);
-			if( err != null ){
-				res.writeHead(200, { 'Content-Type': 'application/json' })
-				res.end(JSON.stringify({reason: `query error: ${err.toString()}`}))
-			}
+		this.query(req, res).then((obj) => {
 
-			return;
+			res.end(JSON.stringify(obj));
 
-		// if oauth
-		} else {
-			let err:Error = this.oauth(req, res);
-			if( err != null ){
-				res.writeHead(200, { 'Content-Type': 'application/json' })
-				res.end(JSON.stringify({reason: `query error: ${err.toString()}`}))
-			}
-		}
+		}).catch( err => {
 
-		res.end();
-	}
-
-
-	query(req: IncomingMessage, res: ServerResponse) : Error{
-
-		let query: ParsedUrlQuery = parseURL(req.url,true).query
-
-		this.chain[0].call(query['q']).then( (obj:object) => {
-			console.log('query success')
 			res.writeHead(200, { 'Content-Type': 'application/json' })
-			res.end(JSON.stringify(obj))
-			return null;
-		}).catch( (err:Error) => {
-			console.log('query error', err)
+			res.end(JSON.stringify({reason: `query error: ${err.toString()}`}))
+
 		})
 
-		return null;
-
 	}
 
-	oauth(req: IncomingMessage, res: ServerResponse) : Error{
-		console.log(`oauth(${req},${res})`);
+
+	async query(req: IncomingMessage, res: ServerResponse) : Promise<object>{
+
 		let query: ParsedUrlQuery = parseURL(req.url,true).query
-		console.log('query is:', query);
-		return new Error('OAuth error');
+		let out:   any[]          = [];
+
+		for( let i = 0 ; i < this.chain.length ; i++ ){
+
+			let input = (i<1) ? query['q'] : out[i-1];
+
+			try {
+				out[i] = await this.chain[i].call(input)
+				printf('ok\n')
+
+			}catch(e){
+				printf('fail\n');
+				throw e
+			}
+
+		}
+
+		return out;
+
 	}
 
 }
\ No newline at end of file