diff --git a/app.js b/app.js
index 1000321..2be4916 100644
--- a/app.js
+++ b/app.js
@@ -90,41 +90,43 @@ sitemap(config, function (sitemap, urls) {
 	
 	var results = _.map(urls, function (url, index) {
 		console.log('Registered ' + url.url);
-		var processResults = processOne(config, url, function (error, record) {
-			if (!!error || !record) {
-				console.error('Error! ' + error.message);
-				if (!!error.pageNotFound && !!record) {
-					pages.deleteObject(record.objectID, function (error, result) {
-						console.log('Object ' + record.objectID + ' has been deleted');
-					});
-				}
-				removeOldEntries();
-				return;
-			}
-			
-			pages.saveObject(record, function (error, result) {
-				if (!!error) {
-					console.log();
-					if (!!result && !!result.message) {
-						console.error('Error! ' + result.message);
-					}
-					if (!!error && !!error.message) {
-						console.error('Error! ' + error.message);
+		setTimeout(function () {
+			var processResults = processOne(config, url, function (error, record) {
+				if (!!error || !record) {
+					console.error('Error! ' + error.message);
+					if (!!error.pageNotFound && !!record) {
+						pages.deleteObject(record.objectID, function (error, result) {
+							console.log('Object ' + record.objectID + ' has been deleted');
+						});
 					}
-					console.log();
-				} else if (record.objectID !== result.objectID) {
-					console.log();
-					console.error('Error! Object ID mismatch!');
-					console.log();
-				} else {
-					console.log('Object %s:%s saved (%s)', record.objectID, record.lang, record.url);
+					removeOldEntries();
+					return;
 				}
-				removeOldEntries();
+				
+				pages.saveObject(record, function (error, result) {
+					if (!!error) {
+						console.log();
+						if (!!result && !!result.message) {
+							console.error('Error! ' + result.message);
+						}
+						if (!!error && !!error.message) {
+							console.error('Error! ' + error.message);
+						}
+						console.log();
+					} else if (record.objectID !== result.objectID) {
+						console.log();
+						console.error('Error! Object ID mismatch!');
+						console.log();
+					} else {
+						console.log('Object %s:%s saved (%s)', record.objectID, record.lang, record.url);
+					}
+					removeOldEntries();
+				});
 			});
-		});
-		if (!processResults.ok) {
-			console.error(processResults.message || 'Error!');
-		}
+			if (!processResults.ok) {
+				console.error(processResults.message || 'Error!');
+			}
+		}, config.delayBetweenRequest * index);
 	});
 	
 	console.log('Sitemap %s registered %s / %s urls', sitemap.url, results.length, urls.length);
diff --git a/config.json b/config.json
index c4dc170..99aa148 100644
--- a/config.json
+++ b/config.json
@@ -17,8 +17,12 @@
 		{"url": "http://example.com/en/sitemap.xml", "lang": "en"}
 	],
 	"http": {
-		"auth": ""
+		"auth": "",
+		"headers": {
+
+		}
 	},
+	"delayBetweenRequest": 100,
 	"selectors": {
 		"title": "title",
 		"image": "meta[property=\"og:image\"]",
diff --git a/lib/process.js b/lib/process.js
index 19501e6..d64609f 100644
--- a/lib/process.js
+++ b/lib/process.js
@@ -139,7 +139,8 @@ module.exports = function (config, url, cb) {
 		port: parsedUrl.port || (parsedUrl.protocol === 'https:' ? 443 : 80),
 		path: parsedUrl.pathname || '/',
 		method: 'GET',
-		auth: config.http && config.http.auth
+		auth: config.http && config.http.auth,
+		headers: config.http.headers
 	};
 	
 	if (!httpOptions.hostname) {
diff --git a/lib/sitemap.js b/lib/sitemap.js
index 4e1e3c1..ff7bfbc 100644
--- a/lib/sitemap.js
+++ b/lib/sitemap.js
@@ -19,7 +19,8 @@ module.exports = function (config, cb) {
 			port: parsedUrl.port || (parsedUrl.protocol === 'https:' ? 443 : 80),
 			path: parsedUrl.path,
 			method: 'GET',
-			auth: config.http && config.http.auth
+			auth: config.http && config.http.auth,
+			headers: config.http.headers
 		};
 		var client = parsedUrl.protocol === 'https:' ? https : http;