diff --git a/ArchiSteamFarm/ArchiWebHandler.cs b/ArchiSteamFarm/ArchiWebHandler.cs
index 672e7e4f2..b94197446 100644
--- a/ArchiSteamFarm/ArchiWebHandler.cs
+++ b/ArchiSteamFarm/ArchiWebHandler.cs
@@ -345,12 +345,24 @@ namespace ArchiSteamFarm {
 				return false;
 			}
 
-			StringBuilder request = new StringBuilder(SteamCommunityURL + "/mobileconf/multiajaxop?op=" + (accept ? "allow" : "cancel") + "&p=" + deviceID + "&a=" + SteamID + "&k=" + WebUtility.UrlEncode(confirmationHash) + "&t=" + time + "&m=android&tag=conf");
+			string request = SteamCommunityURL + "/mobileconf/multiajaxop";
+
+			List<KeyValuePair<string, string>> data = new List<KeyValuePair<string, string>>(7 + confirmations.Count * 2) {
+				new KeyValuePair<string, string>("op", accept ? "allow" : "cancel"),
+				new KeyValuePair<string, string>("p", deviceID),
+				new KeyValuePair<string, string>("a", SteamID.ToString()),
+				new KeyValuePair<string, string>("k", confirmationHash),
+				new KeyValuePair<string, string>("t", time.ToString()),
+				new KeyValuePair<string, string>("m", "android"),
+				new KeyValuePair<string, string>("tag", "conf")
+			};
+
 			foreach (MobileAuthenticator.Confirmation confirmation in confirmations) {
-				request.Append("&cid[]=" + confirmation.ID + "&ck[]=" + confirmation.Key);
+				data.Add(new KeyValuePair<string, string>("cid[]", confirmation.ID.ToString()));
+				data.Add(new KeyValuePair<string, string>("ck[]", confirmation.Key.ToString()));
 			}
 
-			string json = await WebBrowser.UrlGetToContentRetry(request.ToString()).ConfigureAwait(false);
+			string json = await WebBrowser.UrlPostToContentRetry(request, data).ConfigureAwait(false);
 			if (string.IsNullOrEmpty(json)) {
 				return false;
 			}
diff --git a/ArchiSteamFarm/MobileAuthenticator.cs b/ArchiSteamFarm/MobileAuthenticator.cs
index 6107ddfff..c9a723b20 100644
--- a/ArchiSteamFarm/MobileAuthenticator.cs
+++ b/ArchiSteamFarm/MobileAuthenticator.cs
@@ -25,7 +25,6 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
-using System.Linq;
 using System.Security.Cryptography;
 using System.Text;
 using System.Threading;
diff --git a/ArchiSteamFarm/WebBrowser.cs b/ArchiSteamFarm/WebBrowser.cs
index 4bb5d814b..9cdd527b6 100644
--- a/ArchiSteamFarm/WebBrowser.cs
+++ b/ArchiSteamFarm/WebBrowser.cs
@@ -218,7 +218,7 @@ namespace ArchiSteamFarm {
 			return null;
 		}
 
-		internal async Task<bool> UrlPostRetry(string request, Dictionary<string, string> data = null, string referer = null) {
+		internal async Task<bool> UrlPostRetry(string request, ICollection<KeyValuePair<string, string>> data = null, string referer = null) {
 			if (string.IsNullOrEmpty(request)) {
 				Logging.LogNullError(nameof(request), Identifier);
 				return false;
@@ -237,6 +237,25 @@ namespace ArchiSteamFarm {
 			return false;
 		}
 
+		internal async Task<string> UrlPostToContentRetry(string request, ICollection<KeyValuePair<string, string>> data = null, string referer = null) {
+			if (string.IsNullOrEmpty(request)) {
+				Logging.LogNullError(nameof(request), Identifier);
+				return null;
+			}
+
+			string result = null;
+			for (byte i = 0; (i < MaxRetries) && string.IsNullOrEmpty(result); i++) {
+				result = await UrlPostToContent(request, data, referer).ConfigureAwait(false);
+			}
+
+			if (!string.IsNullOrEmpty(result)) {
+				return result;
+			}
+
+			Logging.LogGenericWarning("Request failed even after " + MaxRetries + " tries", Identifier);
+			return null;
+		}
+
 		private async Task<byte[]> UrlGetToBytes(string request, string referer = null) {
 			if (string.IsNullOrEmpty(request)) {
 				Logging.LogNullError(nameof(request), Identifier);
@@ -369,7 +388,7 @@ namespace ArchiSteamFarm {
 			}
 		}
 
-		private async Task<bool> UrlPost(string request, Dictionary<string, string> data = null, string referer = null) {
+		private async Task<bool> UrlPost(string request, IEnumerable<KeyValuePair<string, string>> data = null, string referer = null) {
 			if (string.IsNullOrEmpty(request)) {
 				Logging.LogNullError(nameof(request), Identifier);
 				return false;
@@ -380,7 +399,22 @@ namespace ArchiSteamFarm {
 			}
 		}
 
-		private async Task<HttpResponseMessage> UrlPostToResponse(string request, Dictionary<string, string> data = null, string referer = null) {
+		private async Task<string> UrlPostToContent(string request, IEnumerable<KeyValuePair<string, string>> data = null, string referer = null) {
+			if (string.IsNullOrEmpty(request)) {
+				Logging.LogNullError(nameof(request), Identifier);
+				return null;
+			}
+
+			using (HttpResponseMessage httpResponse = await UrlPostToResponse(request, data, referer).ConfigureAwait(false)) {
+				if (httpResponse == null) {
+					return null;
+				}
+
+				return await httpResponse.Content.ReadAsStringAsync().ConfigureAwait(false);
+			}
+		}
+
+		private async Task<HttpResponseMessage> UrlPostToResponse(string request, IEnumerable<KeyValuePair<string, string>> data = null, string referer = null) {
 			if (!string.IsNullOrEmpty(request)) {
 				return await UrlRequest(request, HttpMethod.Post, data, referer).ConfigureAwait(false);
 			}
@@ -389,7 +423,7 @@ namespace ArchiSteamFarm {
 			return null;
 		}
 
-		private async Task<HttpResponseMessage> UrlRequest(string request, HttpMethod httpMethod, Dictionary<string, string> data = null, string referer = null) {
+		private async Task<HttpResponseMessage> UrlRequest(string request, HttpMethod httpMethod, IEnumerable<KeyValuePair<string, string>> data = null, string referer = null) {
 			if (string.IsNullOrEmpty(request) || (httpMethod == null)) {
 				Logging.LogNullError(nameof(request) + " || " + nameof(httpMethod), Identifier);
 				return null;
@@ -401,7 +435,7 @@ namespace ArchiSteamFarm {
 
 			HttpResponseMessage responseMessage;
 			using (HttpRequestMessage requestMessage = new HttpRequestMessage(httpMethod, request)) {
-				if ((data != null) && (data.Count > 0)) {
+				if (data != null) {
 					try {
 						requestMessage.Content = new FormUrlEncodedContent(data);
 					} catch (UriFormatException e) {