android - Apache 2.4.6 - Sending GZIP content SOMETIMES results in "read more bytes of request body than expected" -

we trying send gziped content web application hosted on tomcat behind apache 2 via mod_proxy's proxypass , proxypassreverse directives. of time works apache rejects these packages , following errors in our apache error logs:

[proxy_http:error] ... ah01086: read more bytes of request body expected (got 16384, expected 1562)   [proxy_http:error] ... ah01097: pass request body failed x.x.x.x:8080 (x.x.x.x) x (x.x.x.x) 

the code sending data based on httpsurlconnection , executed android device. looks this:

url url = new url(constants.url); httpsurlconnection con = (httpsurlconnection) url.openconnection();  con.setrequestmethod("post"); con.setusecaches(false); con.setdoinput(true); con.setdooutput(true); con.setrequestproperty("content-encoding", "gzip"); con.setrequestproperty("content-type", "application/json"); con.setrequestproperty("accept", "application/json"); con.setrequestproperty("user-agent", "myapp 1.0");  outputstream outputstream = con.getoutputstream(); outputstream.write( zipstringtobytes("some possibly long content.") );  outputstream.flush(); outputstream.close();  int responsecode = con.getresponsecode(); 

and function create our gzip string:

private static byte[] zipstringtobytes(string input) throws ioexception {     bytearrayoutputstream bos = new bytearrayoutputstream();      //use printstream avod converting string byte array, can cause out of memory error     final printstream printstream = new printstream(new gzipoutputstream(bos));     printstream.print(input);     printstream.close();      byte[] retval = bos.tobytearray();     bos.close();     return retval; } 

we have not been able figure out reason yet. since seems occur sporadically. makes think might problem content-length, or our code sending data in general, don't know , cannot find , related issues. if have pointers on this, appreciate it.

if need more information, please let me know.

update: found is, expected size same: 16384 expected size varies. maybe helps.

update 2: have disabled chunked mode: con.setchunkedstreamingmode ( 0 ) seems help. can maybe explain if solution , why one. thanks.

ok, able solve issue disabling sending data in chunked mode.

con.setchunkedstreamingmode ( 0 ) 

while have ideas why solves issue, have not come in depth explanation.

as long nobody has better solution or explanation, accept solution.