Content-Length header should be honored when passing an InputStream, close #1440

Motivation:

When Content-Length is known beforehand, we shouldn’t ignore it and
enforce chunked transfer-encoding.

Modification:

Honor Content-Length request header.

Result:

Chunked transfer-encoding is no longer enforced

Author: slandelle

client/src/main/java/org/asynchttpclient/netty/request/NettyRequestFactory.java

@@ -29,6 +29,7 @@
 import io.netty.handler.codec.http.HttpVersion;
 import io.netty.handler.codec.http.cookie.ClientCookieEncoder;
 
+import java.io.InputStream;
 import java.nio.charset.Charset;
 
 import org.asynchttpclient.AsyncHttpClientConfig;
@@ -81,7 +82,9 @@ private NettyBody body(Request request) {
             nettyBody = new NettyByteBufferBody(request.getByteBufferData());
 
         } else if (request.getStreamData() != null) {
-            nettyBody = new NettyInputStreamBody(request.getStreamData());
+            InputStream is = request.getStreamData();
+            String contentLengthHeader = request.getHeaders().get(CONTENT_LENGTH);
+            nettyBody = contentLengthHeader != null ? new NettyInputStreamBody(is, Long.parseLong(contentLengthHeader)) : new NettyInputStreamBody(is);
 
         } else if (isNonEmpty(request.getFormParams())) {
             CharSequence contentTypeOverride = request.getHeaders().contains(CONTENT_TYPE) ? null : HttpHeaderValues.APPLICATION_X_WWW_FORM_URLENCODED;