diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/api/Pay3Api.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/api/Pay3Api.java
index 1d26b31a..ac650d41 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/api/Pay3Api.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/api/Pay3Api.java
@@ -344,7 +344,7 @@ public class Pay3Api {
 				writer.newLine();
 			}
 		} catch (IOException e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException(e);
 		} finally {
 			try {
 				if (reader != null) {
diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/exception/WeixinException.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/exception/WeixinException.java
index 1ad6c619..084c6e34 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/exception/WeixinException.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/exception/WeixinException.java
@@ -1,7 +1,5 @@
 package com.foxinmy.weixin4j.exception;
 
-import java.io.IOException;
-
 import com.foxinmy.weixin4j.util.StringUtil;
 
 /**
@@ -34,8 +32,8 @@ public class WeixinException extends Exception {
 		super(e);
 	}
 
-	public WeixinException(String msg, IOException ex) {
-		super(msg, ex);
+	public WeixinException(String message, Throwable cause) {
+		super(message, cause);
 	}
 
 	public String getErrorCode() {
diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/weixin/WeixinRequestExecutor.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/weixin/WeixinRequestExecutor.java
index 9dbcb9cc..a540ea2e 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/weixin/WeixinRequestExecutor.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/weixin/WeixinRequestExecutor.java
@@ -20,6 +20,7 @@ import com.foxinmy.weixin4j.http.entity.FormUrlEntity;
 import com.foxinmy.weixin4j.http.entity.HttpEntity;
 import com.foxinmy.weixin4j.http.entity.StringEntity;
 import com.foxinmy.weixin4j.http.factory.HttpClientFactory;
+import com.foxinmy.weixin4j.http.factory.SimpleHttpClientFactory;
 import com.foxinmy.weixin4j.model.Consts;
 import com.foxinmy.weixin4j.util.StringUtil;
 import com.foxinmy.weixin4j.util.WeixinErrorUtil;
@@ -44,6 +45,7 @@ public class WeixinRequestExecutor {
 	}
 
 	public WeixinRequestExecutor(HttpParams params) {
+		HttpClientFactory.setDefaultFactory(new SimpleHttpClientFactory());
 		this.httpClient = HttpClientFactory.getInstance();
 		this.params = params;
 	}
diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/weixin/WeixinSSLRequestExecutor.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/weixin/WeixinSSLRequestExecutor.java
index 07fba7c2..98be4304 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/weixin/WeixinSSLRequestExecutor.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/weixin/WeixinSSLRequestExecutor.java
@@ -1,7 +1,9 @@
 package com.foxinmy.weixin4j.http.weixin;
 
 import java.io.InputStream;
+import java.security.KeyManagementException;
 import java.security.KeyStore;
+import java.security.NoSuchAlgorithmException;
 
 import javax.net.ssl.KeyManagerFactory;
 import javax.net.ssl.SSLContext;
@@ -34,7 +36,7 @@ public class WeixinSSLRequestExecutor extends WeixinRequestExecutor {
 			sslContext.init(kmf.getKeyManagers(), null,
 					new java.security.SecureRandom());
 		} catch (Exception e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException("Key load error", e);
 		}
 		params.setSSLContext(sslContext);
 	}
diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/token/FileTokenStorager.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/token/FileTokenStorager.java
index 92575c49..d2aef8aa 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/token/FileTokenStorager.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/token/FileTokenStorager.java
@@ -43,7 +43,7 @@ public class FileTokenStorager implements TokenStorager {
 			}
 			return null;
 		} catch (IOException e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException(e);
 		}
 	}
 
@@ -55,7 +55,7 @@ public class FileTokenStorager implements TokenStorager {
 					new FileOutputStream(new File(String.format("%s/%s.xml",
 							cachePath, cacheKey))));
 		} catch (IOException e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException(e);
 		}
 	}
 }
diff --git a/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/MediaApi.java b/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/MediaApi.java
index 283c93f3..2f1a8e87 100644
--- a/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/MediaApi.java
+++ b/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/MediaApi.java
@@ -272,7 +272,7 @@ public class MediaApi extends MpApi {
 						file.getAbsolutePath()));
 			}
 		} catch (IOException e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException(e);
 		} finally {
 			try {
 				if (os != null) {
@@ -346,7 +346,7 @@ public class MediaApi extends MpApi {
 			return new MediaDownloadResult(content,
 					ContentType.create(contentType), fileName);
 		} catch (IOException e) {
-			throw new WeixinException("I/O Error on getBody");
+			throw new WeixinException("I/O Error on getBody", e);
 		} catch (HttpClientException e) {
 			throw new WeixinException(e);
 		}
diff --git a/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/Pay2Api.java b/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/Pay2Api.java
index ae0d19cc..d47e1c39 100644
--- a/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/Pay2Api.java
+++ b/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/Pay2Api.java
@@ -238,7 +238,7 @@ public class Pay2Api extends MpApi {
 		} catch (WeixinException e) {
 			throw e;
 		} catch (Exception e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException(e);
 		} finally {
 			if (ca != null) {
 				try {
@@ -389,7 +389,7 @@ public class Pay2Api extends MpApi {
 				writer.newLine();
 			}
 		} catch (IOException e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException(e);
 		} finally {
 			try {
 				if (reader != null) {
diff --git a/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/QrApi.java b/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/QrApi.java
index 64032cb7..fc511269 100644
--- a/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/QrApi.java
+++ b/weixin4j-mp/src/main/java/com/foxinmy/weixin4j/mp/api/QrApi.java
@@ -95,7 +95,7 @@ public class QrApi extends MpApi {
 			os = new FileOutputStream(file);
 			os.write(qrResult.getContent());
 		} catch (IOException e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException(e);
 		} finally {
 			try {
 				if (os != null) {
diff --git a/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/TokenTest.java b/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/TokenTest.java
index f63896e0..ce934c88 100644
--- a/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/TokenTest.java
+++ b/weixin4j-mp/src/test/java/com/foxinmy/weixin4j/mp/test/TokenTest.java
@@ -6,7 +6,6 @@ import org.junit.Test;
 
 import com.foxinmy.weixin4j.exception.WeixinException;
 import com.foxinmy.weixin4j.model.WeixinAccount;
-import com.foxinmy.weixin4j.mp.api.MenuApi;
 import com.foxinmy.weixin4j.mp.token.WeixinTokenCreator;
 import com.foxinmy.weixin4j.token.FileTokenStorager;
 import com.foxinmy.weixin4j.token.TokenHolder;
diff --git a/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/api/MediaApi.java b/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/api/MediaApi.java
index c8f9c4d0..8f6b5d11 100644
--- a/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/api/MediaApi.java
+++ b/weixin4j-qy/src/main/java/com/foxinmy/weixin4j/qy/api/MediaApi.java
@@ -200,7 +200,7 @@ public class MediaApi extends QyApi {
 						file.getAbsolutePath()));
 			}
 		} catch (IOException e) {
-			throw new WeixinException(e.getMessage());
+			throw new WeixinException(e);
 		} finally {
 			try {
 				if (os != null) {
@@ -272,7 +272,7 @@ public class MediaApi extends QyApi {
 			return new MediaDownloadResult(content,
 					ContentType.create(contentType), fileName);
 		} catch (IOException e) {
-			throw new WeixinException("I/O Error on getBody");
+			throw new WeixinException("I/O Error on getBody", e);
 		} catch (HttpClientException e) {
 			throw new WeixinException(e);
 		}