diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/apache/InputStreamBody.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/apache/InputStreamBody.java
index a0993907..2ee8a89a 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/apache/InputStreamBody.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/apache/InputStreamBody.java
@@ -85,7 +85,7 @@ public class InputStreamBody extends AbstractContentBody {
 	}
 
 	public long getContentLength() {
-		return contentLength;
+		return this.contentLength;
 	}
 
 	public String getFilename() {
diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/apache/MultipartEntity.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/apache/MultipartEntity.java
index b8992218..e80130b1 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/apache/MultipartEntity.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/apache/MultipartEntity.java
@@ -165,5 +165,6 @@ public class MultipartEntity implements HttpEntity {
 
 	public void writeTo(final OutputStream outstream) throws IOException {
 		this.multipart.writeTo(outstream);
+		outstream.flush();
 	}
 }
diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/factory/Netty4HttpClient.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/factory/Netty4HttpClient.java
index de5c4ebd..0fd725ca 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/factory/Netty4HttpClient.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/factory/Netty4HttpClient.java
@@ -145,6 +145,7 @@ public class Netty4HttpClient extends AbstractHttpClient {
 			ByteBuf byteBuf = ByteBufAllocator.DEFAULT.buffer();
 			ByteBufOutputStream out = new ByteBufOutputStream(byteBuf);
 			entity.writeTo(out);
+			out.flush();
 			out.close();
 			uriRequest = new DefaultFullHttpRequest(
 					uriRequest.getProtocolVersion(), uriRequest.getMethod(),