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From Thad Humphries <>
Subject Re: Can ClientAbortException be circumvented?
Date Wed, 27 Mar 2013 21:20:18 GMT
On Tue, Mar 26, 2013 at 3:56 PM, Christopher Schultz <> wrote:

> Hash: SHA256
> Thad,
> Coming a little late to the party...
> On 3/24/13 4:30 PM, Thad Humphries wrote:
> > I have a web-app that uses a servlet for downloading files from a
> > repository--PDF, Office, images, zip, etc. It works with desktop
> > browsers--IE, Firefox, Chrome, and Safari--on their various
> > platforms. It also works fine with Firefox from Android (2.3 and
> > 4.x tested). However when I try with Android's default WebKit
> > browser, the servlet fails immediately with
> > org.apache.catalina.connector.ClientAbortException (so says the
> > stderr log).
> This smells like it might be a Range request issue. Is the client
> sending a Range header along with the request? Are you respecting it?

I don't see a Range header from my servlet. Here's the request;

Accept-Encoding: gzip
Accept-Language: en-US
Cookie: JSESSIONID=0AACB4E188B2B68605FE0189C007F7BB
Accept-Charset: utf-8, iso-8859-1, utf-16, *;q=0.7
Keep-Alive: 115
User-Agent: Mozilla/5.0 (Linux; U; Android 2.3.5; en-us; HTC-A9192/1.0
Build/GRJ90) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile
x-att-deviceid: HTC-A9192/1.0
Connection: keep-alive

Here's the response:

HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Expires: 0
Cache-Control: private
Pragma: cache
Content-Disposition: attachment; filename="grilled_romaine.doc"
Content-Type: application/msword
Content-Length: 12288
Date: Wed, 27 Mar 2013 20:46:02 GMT

> I wouldn't be surprised if what's happening is that you are getting a
> Range request (maybe for the first few hundred bytes) and you are
> ignoring it, returning the entire file. Once the client gets enough
> bytes, it simply closes the connection and the rest of the bytes in
> transit fall on the floor.
> If the next request is for the last few hundred bytes (frequently,
> this will happen with ZIP and PDF files, since there is critical
> information at the /end/ of the file) and you return the whole file,
> the client may give up at any point (which IMO is silly) in the same way.
> > I suspect this is a problem with mobile WebKit, and that
> > circumventing the abort might be a "bad thing" even if it's
> > possible. However I thought I'd inquire here if there is a Tomcat
> > way around it. If not, it seems my alternatives are (1) use Java
> > Mail to mail the user the file, since mail apps open their
> > attachments; and (2) write iOS and Android apps file query and
> > downloading. Neither prospect thrills me.
> If the problem truly is Range-related, you may be able to alter your
> servlet to respect the Range request. Of primary benefit will be that
> you will (probably) be sending fewer bytes over the network, which can
> significantly improve performance. Obviously, the secondary benefit
> will be that you don't get these errors anymore.
> Of course, coping with Range requests is non-trivial. Be sure to read
> the RFPs very closely.
> - -chris
> Version: GnuPG/MacGPG2 v2.0.17 (Darwin)
> Comment: GPGTools -
> Comment: Using GnuPG with Thunderbird -
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> =mn1G
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