diff --git a/Sources/HexavilleAuth/OAuth/OAuth1.swift b/Sources/HexavilleAuth/OAuth/OAuth1.swift
index 38ba670..92d2498 100644
--- a/Sources/HexavilleAuth/OAuth/OAuth1.swift
+++ b/Sources/HexavilleAuth/OAuth/OAuth1.swift
@@ -23,6 +23,18 @@ public enum OAuth1Error: Error {
 extension OAuth1Error: CustomStringConvertible {
     public var description: String {
         switch self {
+        case .couldNotGenerateSignature:
+            return "couldNotGenerateSignature"
+            
+        case .invalidAuthrozeURL(let url):
+            return "invalidAuthrozeURL: \(url)"
+            
+        case .missingRequiredParameters(let param):
+            return "missingRequiredParameter: \(param)"
+            
+        case .accessTokenIsMissingInSession:
+            return "accessTokenIsMissingInSession"
+            
         case .verifyFailed(let req, let res):
             return stringify(code: "verifyFailed", request: req, response: res)
             
@@ -31,9 +43,6 @@ extension OAuth1Error: CustomStringConvertible {
             
         case .failedToGetRequestToken(let req, let res):
             return stringify(code: "failedToGetRequestToken", request: req, response: res)
-            
-        default:
-            return "\(self)"
         }
     }
     
@@ -123,22 +132,23 @@ public class OAuth1 {
         
         params["oauth_signature"] = sig
         
-        var urlRequest = URLRequest(url: URL(string: requestTokenUrl)!)
-        urlRequest.httpMethod = "POST"
-        
-        urlRequest.addValue(OAuth1.oAuthAuthorizationString(fromParameters: params, withAllowedCharacters: withAllowedCharacters), forHTTPHeaderField: "Authorization")
-        
-        let (response, data) = try URLSession.shared.resumeSync(with: urlRequest)
+        let authorizationValue = OAuth1.oAuthAuthorizationString(fromParameters: params, withAllowedCharacters: withAllowedCharacters)
         
-        let bodyDictionary = OAuth1.parse(bodyData: data)
+        let request = Request(
+            method: .post,
+            url: URL(string: requestTokenUrl)!,
+            headers: ["Authorization": authorizationValue]
+        )
+        let client = try HTTPClient(url: request.url)
+        try client.open()
+        let response = try client.request(request)
         
         guard (200..<300).contains(response.statusCode) else {
-            throw OAuth1Error.failedToGetRequestToken(
-                urlRequest.transform(),
-                response.transform(withBodyData: data)
-            )
+            throw OAuth1Error.failedToGetRequestToken(request, response)
         }
         
+        let bodyDictionary = OAuth1.parse(bodyData: response.body.asData())
+        
         guard let oauthToken = bodyDictionary["oauth_token"] else {
             throw OAuth1Error.missingRequiredParameters("oauth_token")
         }
@@ -189,21 +199,23 @@ public class OAuth1 {
         
         params["oauth_signature"] = sig
         
-        var urlRequest = URLRequest(url: URL(string: verifyURL)!)
-        urlRequest.httpMethod = "GET"
+        let authrozationString = OAuth1.oAuthAuthorizationString(fromParameters: params, withAllowedCharacters: withAllowedCharacters)
         
-        urlRequest.addValue(OAuth1.oAuthAuthorizationString(fromParameters: params, withAllowedCharacters: withAllowedCharacters), forHTTPHeaderField: "Authorization")
+        let request = Request(
+            method: .get,
+            url: URL(string: verifyURL)!,
+            headers: ["Authorization": authrozationString]
+        )
         
-        let (response, data) = try URLSession.shared.resumeSync(with: urlRequest)
+        let client = try HTTPClient(url: request.url)
+        try client.open()
+        let response = try client.request(request)
         
         guard (200..<300).contains(response.statusCode) else {
-            throw OAuth1Error.verifyFailed(
-                urlRequest.transform(),
-                response.transform(withBodyData: data)
-            )
+            throw OAuth1Error.verifyFailed(request, response)
         }
         
-        return try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] ?? [:]
+        return try JSONSerialization.jsonObject(with: response.body.asData(), options: []) as? [String: Any] ?? [:]
     }
     
     public func getAccessToken(request: Request, requestToken: RequestToken) throws -> Credential {
@@ -239,21 +251,23 @@ public class OAuth1 {
         
         params["oauth_signature"] = sig
         
-        var urlRequest = URLRequest(url: URL(string: urlString)!)
-        urlRequest.httpMethod = "POST"
+        let authrozationString = OAuth1.oAuthAuthorizationString(fromParameters: params, withAllowedCharacters: withAllowedCharacters)
         
-        urlRequest.addValue(OAuth1.oAuthAuthorizationString(fromParameters: params, withAllowedCharacters: withAllowedCharacters), forHTTPHeaderField: "Authorization")
+        let request = Request(
+            method: .post,
+            url: URL(string: urlString)!,
+            headers: ["Authorization": authrozationString]
+        )
         
-        let (response, data) = try URLSession.shared.resumeSync(with: urlRequest)
+        let client = try HTTPClient(url: request.url)
+        try client.open()
+        let response = try client.request(request)
         
         guard (200..<300).contains(response.statusCode) else {
-            throw OAuth1Error.failedToGetAccessToken(
-                urlRequest.transform(),
-                response.transform(withBodyData: data)
-            )
+            throw OAuth1Error.failedToGetAccessToken(request, response)
         }
         
-        return try Credential(withDictionary: OAuth1.parse(bodyData: data))
+        return try Credential(withDictionary: OAuth1.parse(bodyData: response.body.asData()))
     }
 }
 
diff --git a/Sources/HexavilleAuth/OAuth/OAuth2.swift b/Sources/HexavilleAuth/OAuth/OAuth2.swift
index f8ebdd9..d893fe4 100644
--- a/Sources/HexavilleAuth/OAuth/OAuth2.swift
+++ b/Sources/HexavilleAuth/OAuth/OAuth2.swift
@@ -68,20 +68,26 @@ public class OAuth2 {
             "redirect_uri=\(self.callbackURL.absoluteURL()!.absoluteString)"
         ]
         
-        var request = URLRequest(url: url)
-        request.httpMethod = "POST"
-        request.addValue("application/json", forHTTPHeaderField: "Accept")
-        request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
-        request.httpBody = body.joined(separator: "&").data
+        let request = Request(
+            method: .post,
+            url: url,
+            headers: [
+                "Accept": "application/json",
+                "Content-Type": "application/x-www-form-urlencoded"
+            ],
+            body: body.joined(separator: "&").data
+        )
         
-        let (response, bodyData) = try URLSession.shared.resumeSync(with: request)
+        let client = try HTTPClient(url: request.url)
+        try client.open()
+        let response = try client.request(request)
         
         guard (200..<300).contains(response.statusCode) else {
-            throw HexavilleAuthError.responseError(response.transform(withBodyData: bodyData))
+            throw HexavilleAuthError.responseError(response)
         }
         
         do {
-            let bodyDictionary = try JSONSerialization.jsonObject(with: bodyData, options: []) as! [String: Any]
+            let bodyDictionary = try JSONSerialization.jsonObject(with: response.body.asData(), options: []) as! [String: Any]
             return try Credential(withDictionary: bodyDictionary)
         } catch {
             throw error
diff --git a/Sources/HexavilleAuth/Providers/OAuth2/FacebookAuthorizationProvider.swift b/Sources/HexavilleAuth/Providers/OAuth2/FacebookAuthorizationProvider.swift
index bd38b4c..ea33c85 100644
--- a/Sources/HexavilleAuth/Providers/OAuth2/FacebookAuthorizationProvider.swift
+++ b/Sources/HexavilleAuth/Providers/OAuth2/FacebookAuthorizationProvider.swift
@@ -38,14 +38,21 @@ public struct FacebookAuthorizationProvider: OAuth2AuthorizationProvidable {
     
     public func authorize(request: Request) throws -> (Credential, LoginUser)  {
         let credential = try self.getAccessToken(request: request)
-        let url = URL(string: "https://graph.facebook.com/me?fields=id,name,email,picture,gender&access_token=\(credential.accessToken)")!
-        let (response, data) = try URLSession.shared.resumeSync(with: URLRequest(url: url))
+        
+        let request = Request(
+            method: .get,
+            url: URL(string: "https://graph.facebook.com/me?fields=id,name,email,picture,gender&access_token=\(credential.accessToken)")!
+        )
+        
+        let client = try HTTPClient(url: request.url)
+        try client.open()
+        let response = try client.request(request)
         
         guard (200..<300).contains(response.statusCode) else {
-            throw HexavilleAuthError.responseError(response.transform(withBodyData: data))
+            throw HexavilleAuthError.responseError(response)
         }
         
-        guard let json = try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] else {
+        guard let json = try JSONSerialization.jsonObject(with: response.body.asData(), options: []) as? [String: Any] else {
             throw FacebookAuthorizationProviderError.bodyShouldBeAJSON
         }
         
diff --git a/Sources/HexavilleAuth/Providers/OAuth2/GithubAuthorizationProvider.swift b/Sources/HexavilleAuth/Providers/OAuth2/GithubAuthorizationProvider.swift
index e01f159..840e550 100644
--- a/Sources/HexavilleAuth/Providers/OAuth2/GithubAuthorizationProvider.swift
+++ b/Sources/HexavilleAuth/Providers/OAuth2/GithubAuthorizationProvider.swift
@@ -38,14 +38,21 @@ public struct GithubAuthorizationProvider: OAuth2AuthorizationProvidable {
     
     public func authorize(request: Request) throws -> (Credential, LoginUser)  {
         let credential = try self.getAccessToken(request: request)
-        let url = URL(string: "https://api.github.com/user?access_token=\(credential.accessToken)")!
-        let (response, data) = try URLSession.shared.resumeSync(with: URLRequest(url: url))
+        
+        let request = Request(
+            method: .get,
+            url: URL(string: "https://api.github.com/user?access_token=\(credential.accessToken)")!
+        )
+        
+        let client = try HTTPClient(url: request.url)
+        try client.open()
+        let response = try client.request(request)
         
         guard (200..<300).contains(response.statusCode) else {
-            throw HexavilleAuthError.responseError(response.transform(withBodyData: data))
+            throw HexavilleAuthError.responseError(response)
         }
         
-        guard let json = try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] else {
+        guard let json = try JSONSerialization.jsonObject(with: response.body.asData(), options: []) as? [String: Any] else {
             throw GithubAuthorizationProviderError.bodyShouldBeAJSON
         }
         
diff --git a/Sources/HexavilleAuth/URLSession.swift b/Sources/HexavilleAuth/URLSession.swift
deleted file mode 100644
index b578dd0..0000000
--- a/Sources/HexavilleAuth/URLSession.swift
+++ /dev/null
@@ -1,41 +0,0 @@
-//
-//  URLSession.swift
-//  HexavilleAuth
-//
-//  Created by Yuki Takei on 2017/05/31.
-//
-//
-
-import Prorsum
-import Foundation
-
-#if os(Linux)
-let _urlSessionShared = URLSession(configuration: URLSessionConfiguration(), delegate: nil, delegateQueue: nil)
-    extension URLSession {
-        static var shared: URLSession {
-            return _urlSessionShared
-        }
-    }
-#endif
-
-extension URLSession {
-    func resumeSync(with request: URLRequest) throws -> (HTTPURLResponse, Data) {
-        let chan = Channel<(Error?, (HTTPURLResponse, Data)?)>.make(capacity: 1)
-        
-        let task = self.dataTask(with: request) { data, response, error in
-            if let error = error {
-                try! chan.send((error, nil))
-                return
-            }
-            try! chan.send((nil, (response as! HTTPURLResponse, data!)))
-        }
-        
-        task.resume()
-        
-        let (err, tupple) = try chan.receive()
-        if let error = err {
-            throw error
-        }
-        return (tupple!.0, tupple!.1)
-    }
-}