diff --git a/.gitignore b/.gitignore
index a0c842c..b52ee89 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 /node_modules
 /package-lock.json
 /dist
-*.js
\ No newline at end of file
+*.js
+types/request\.d\.ts
diff --git a/cnf/api_keys.json b/cnf/api_keys.json
new file mode 100644
index 0000000..1a1cdcd
--- /dev/null
+++ b/cnf/api_keys.json
@@ -0,0 +1,6 @@
+{
+	"carrefour": {
+		"app_id": "1e70cf82-6062-4067-8b6c-e5f34c0643b7",
+		"app_secret": "eO8cF7qL5hX2wG0bT5hY6aV2kM7oE8aT2hT4iE8iP5aK3aT4pH"
+	}
+}
\ No newline at end of file
diff --git a/src/mixer.ts b/src/mixer.ts
index e03a58f..fc9e83b 100644
--- a/src/mixer.ts
+++ b/src/mixer.ts
@@ -27,18 +27,28 @@ export default class Mixer {
 
 	async http_handler(req: IncomingMessage, res: ServerResponse){
 
-		let urlObj : UrlWithParsedQuery = parseURL(req.url,true)
-		printf('\n  -- new client --\n')
+		let urlObj : UrlWithParsedQuery = parseURL(req.url, true)
 
 		// reject invalid requests
-		if( req.method != 'POST' )                               return Mixer.http_error(res, 'only POST method allowed');
+		if( req.method != 'GET' )                                return Mixer.http_error(res, 'only GET method allowed');
 		else if( Mixer.valid_urls.indexOf(urlObj.pathname) < 0 ) return Mixer.http_error(res, `only URI [${Mixer.valid_urls}] allowed`);
 
+		printf('\n  -- new request --\n')
 		try{
 
 			let query_result = await this.query(req, res)
-			res.writeHead(200, { 'Content-Type': 'application/json' })
-			res.end(JSON.stringify( this.format(query_result) ));
+
+			// if accept is set to HTML -> html format
+			if( req.headers['accept'] && req.headers['accept'].includes("json") ){
+				res.writeHead(200, { 'Content-Type': 'application/json' })
+				res.end(JSON.stringify( this.format(query_result) ));
+
+				// fallback to JSON by default
+			} else{
+				res.writeHead(200, { 'Content-Type': 'text/html' })
+				let query = parseURL(req.url,true).query['q']
+				res.end(this.toHTML(query, this.format(query_result)) );
+			}
 
 		}catch(err){
 
@@ -47,6 +57,8 @@ export default class Mixer {
 
 		}
 
+		printf('  -- response sent --\n')
+
 	}
 
 
@@ -95,4 +107,49 @@ export default class Mixer {
 		}
 	}
 
+
+	toHTML(request:any, input:any) : string {
+		let html = `<html>
+		<head>
+			<title>results of '${request}'</title>
+			<meta charset='utf8'/>
+			<style type='text/css'>
+				table{ border-collapse: collapse; }
+				td{ border: 1px solid #ccc; text-align: center; padding: 0.2em 1em; }
+				thead * { font-weight: bold }
+			</style>
+		</head>
+		<body>
+			<table>
+				<thead><tr>
+					<td>name</td>
+					<td>gtin</td>
+					<td>description</td>
+					<td>quantity</td>
+					<td>images</td>
+				</tr></thead>
+				<tbody>`
+
+		for( let i = 0 ; i < input.results.length ; i++ ){
+			html += `<tr>
+				<td>${input.results[i].name}</td>
+				<td>${input.results[i].gtin}</td>
+				<td>${input.results[i].description}</td>
+				<td><b>${input.results[i].quantity.value}</b> ${input.results[i].quantity.unit}</td><td>`
+
+			if( input.results[i]['images'] ){
+
+				let keys = Object.keys(input.results[i].images)
+				for( let k of keys )
+					if( input.results[i].images[k] != null )
+						html += `<a href='${input.results[i].images[k]}'><img src='${input.results[i].images[k]}' width=20 height=20/></a>`
+
+			}
+
+			html += `</td></tr>`
+		}
+
+		return html
+	}
+
 }
\ No newline at end of file

name	gtin	description	quantity	images
${input.results[i].name}	${input.results[i].gtin}	${input.results[i].description}	${input.results[i].quantity.value} ${input.results[i].quantity.unit}	` + + if( input.results[i]['images'] ){ + + let keys = Object.keys(input.results[i].images) + for( let k of keys ) + if( input.results[i].images[k] != null ) + html += `` + + } + + html += `