diff --git a/src/cocoatweet/api/favorite/create.cc b/src/cocoatweet/api/favorite/create.cc
index ece7181..1d4cc83 100644
--- a/src/cocoatweet/api/favorite/create.cc
+++ b/src/cocoatweet/api/favorite/create.cc
@@ -1,5 +1,5 @@
 #include <cocoatweet/api/favorite/create.h>
-#include <iostream>
+
 namespace CocoaTweet::API::Favorites {
 Create::Create() {
   contentType_ = "application/x-www-form-urlencoded";
@@ -12,7 +12,6 @@ void Create::id(const std::string& _id) {
 
 void Create::process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth) {
   HttpPost::process(_oauth, [](const unsigned int _, const std::string& _srv) {
-    std::cout << _srv << std::endl;
   });
 }
 } // namespace CocoaTweet::API::Favorites
diff --git a/src/cocoatweet/api/favorite/destroy.cc b/src/cocoatweet/api/favorite/destroy.cc
index dac36fa..23d4a6d 100644
--- a/src/cocoatweet/api/favorite/destroy.cc
+++ b/src/cocoatweet/api/favorite/destroy.cc
@@ -1,5 +1,5 @@
 #include <cocoatweet/api/favorite/destroy.h>
-#include <iostream>
+
 namespace CocoaTweet::API::Favorites {
 Destroy::Destroy() {
   contentType_ = "application/x-www-form-urlencoded";
@@ -12,7 +12,6 @@ void Destroy::id(const std::string& _id) {
 
 void Destroy::process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth) {
   HttpPost::process(_oauth, [](const unsigned int _, const std::string& _srv) {
-    std::cout << _srv << std::endl;
   });
 }
 } // namespace CocoaTweet::API::Favorites
diff --git a/src/cocoatweet/api/favorite/favorite.cc b/src/cocoatweet/api/favorite/favorite.cc
index 6bdb88d..99c0898 100644
--- a/src/cocoatweet/api/favorite/favorite.cc
+++ b/src/cocoatweet/api/favorite/favorite.cc
@@ -1,5 +1,3 @@
-#include <iostream>
-
 #include "cocoatweet/api/favorite/favorite.h"
 #include "cocoatweet/api/favorite/create.h"
 #include "cocoatweet/api/favorite/destroy.h"
diff --git a/src/cocoatweet/api/interface/httpPost.cc b/src/cocoatweet/api/interface/httpPost.cc
index d320ce3..96d355c 100644
--- a/src/cocoatweet/api/interface/httpPost.cc
+++ b/src/cocoatweet/api/interface/httpPost.cc
@@ -4,7 +4,7 @@
 #include <memory>
 #include <vector>
 #include <sstream>
-#include <iostream>
+#include <stdexcept>
 extern "C" {
 #include <curl/curl.h>
 }
@@ -31,7 +31,6 @@ void HttpPost::process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,
   auto signature = oauth->signature(sigingParam, "POST", url_);
 
   // 作成した署名をエンドポイントへのパラメータ及びOAuthパラメータに登録
-  std::cout << "signature : " << signature["oauth_signature"] << std::endl;
   oauthParam.merge(signature);
 
   // リクエストボディの構築
@@ -43,7 +42,6 @@ void HttpPost::process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,
     }
     requestBody = CocoaTweet::Util::join(tmp, "&");
   }
-  std::cout << "request Body -> " << requestBody << std::endl;
 
   // ヘッダの構築
   std::string oauthHeader = "authorization: OAuth ";
@@ -54,7 +52,6 @@ void HttpPost::process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,
     }
     oauthHeader += CocoaTweet::Util::join(tmp, ",");
   }
-  std::cout << "OAuth Header -> " << oauthHeader << std::endl;
 
   // do post
   CURL* curl;
@@ -63,7 +60,6 @@ void HttpPost::process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,
   long responseCode;
   curl = curl_easy_init();
   url_ = url_;
-  std::cout << "URL : " << url_ << std::endl;
   if (curl) {
     curl_easy_setopt(curl, CURLOPT_URL, url_.c_str());
     curl_easy_setopt(curl, CURLOPT_POST, 1);
@@ -71,7 +67,9 @@ void HttpPost::process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,
     curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, requestBody.length());
     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curlCallback_);
     curl_easy_setopt(curl, CURLOPT_WRITEDATA, (std::string*)&rcv);
+#ifndef NDEBUG
     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+#endif
     // Headerを保持するcurl_slist*を初期化
     struct curl_slist* headers = NULL;
     // Authorizationをヘッダに追加
@@ -83,7 +81,7 @@ void HttpPost::process(std::weak_ptr<CocoaTweet::OAuth::OAuth1> _oauth,
   }
 
   if (res != CURLE_OK) {
-    std::cout << "curl error : " << res << std::endl;
+    throw std::runtime_error(std::string("INTERNAL ERROR : curl(") + std::to_string(res) + ")");
     exit(1);
   }
 
diff --git a/src/cocoatweet/api/model/tweet.cc b/src/cocoatweet/api/model/tweet.cc
index 5eb782a..0f617ce 100644
--- a/src/cocoatweet/api/model/tweet.cc
+++ b/src/cocoatweet/api/model/tweet.cc
@@ -6,8 +6,6 @@
 #include <cocoatweet/exception/rateLimitException.h>
 #include "nlohmann/json.hpp"
 
-#include <iostream>
-
 namespace CocoaTweet::API::Model {
 Tweet Tweet::parse(const unsigned int _responseCode, const std::string& _json) {
   auto j = nlohmann::json::parse(_json);
diff --git a/src/cocoatweet/api/status/destroy.cc b/src/cocoatweet/api/status/destroy.cc
index 257e8fb..bee285e 100644
--- a/src/cocoatweet/api/status/destroy.cc
+++ b/src/cocoatweet/api/status/destroy.cc
@@ -1,6 +1,6 @@
 #include "cocoatweet/api/status/destroy.h"
 #include <cocoatweet/api/model/tweet.h>
-#include <iostream>
+
 namespace CocoaTweet::API::Statuses {
 Destroy::Destroy() {}
 void Destroy::id(const std::string _id) {
diff --git a/src/cocoatweet/api/status/status.cc b/src/cocoatweet/api/status/status.cc
index 7ea485d..ce9d288 100644
--- a/src/cocoatweet/api/status/status.cc
+++ b/src/cocoatweet/api/status/status.cc
@@ -1,5 +1,3 @@
-#include <iostream>
-
 #include "cocoatweet/api/status/status.h"
 #include "cocoatweet/api/status/update.h"
 #include "cocoatweet/api/status/destroy.h"
diff --git a/src/cocoatweet/api/status/update.cc b/src/cocoatweet/api/status/update.cc
index af6e04b..e6e8612 100644
--- a/src/cocoatweet/api/status/update.cc
+++ b/src/cocoatweet/api/status/update.cc
@@ -1,5 +1,4 @@
 #include "cocoatweet/api/status/update.h"
-#include <iostream>
 
 namespace CocoaTweet::API::Statuses {
 Update::Update() {
diff --git a/src/cocoatweet/oauth/oauth.cc b/src/cocoatweet/oauth/oauth.cc
index 7895229..8224e68 100644
--- a/src/cocoatweet/oauth/oauth.cc
+++ b/src/cocoatweet/oauth/oauth.cc
@@ -7,7 +7,6 @@
 #include <string>
 #include <cstring>
 #include <iterator>
-#include <iostream>
 
 extern "C" {
 #include <openssl/hmac.h>
@@ -26,7 +25,6 @@ std::map<std::string, std::string> OAuth1::signature(
   std::vector<std::string> tmp;
   for (const auto& [key, value] : _param) {
     tmp.push_back(key + "=" + value);
-    std::cout << (key + "=" + value) << std::endl;
   }
 
   std::string query = CocoaTweet::Util::join(tmp, "&");
@@ -36,10 +34,6 @@ std::map<std::string, std::string> OAuth1::signature(
                          CocoaTweet::Util::urlEncode(query);
   auto k64Sha1 = hmacSha1(significateKey, significateBase);
 
-  std::cout << "significate key : " << significateKey << std::endl;
-  std::cout << "significate base : " << significateBase << std::endl;
-  std::cout << "hmac-sha1 : " << k64Sha1 << std::endl;
-
   auto ret = std::map<std::string, std::string>{{"oauth_signature", k64Sha1}};
   return ret;
 }