You are viewing a plain text version of this content. The canonical link for it is here.
Posted to users@tomcat.apache.org by "Hanks Wang (hanwan)" <ha...@cisco.com> on 2008/02/29 07:02:18 UTC
Zero-pad the chunk length which generated by tomcat automatically
Hi Filip,
Seems the method still has a problem:
In real world, the chunk-size will be "zero-pad" until 8 bytes.
For example: if I have a chunk which length is 20(HEX),
The chunk-length should be : 00000020
But the chunk-length generated by tomcat is 20.
Is it possible to make tomcat zero-pad the chunk-length?
Thanks!
Han
-----Original Message-----
From: Hanks Wang (hanwan)
Sent: Friday, February 29, 2008 9:15 AM
To: 'Tomcat Users List'
Subject: RE: how to send http response in several chunked package with
Tomcat
My God, I am actually not aware of that despite it's so obvious...
Thank u Filip!
B.R
Han
-----Original Message-----
From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com]
Sent: Thursday, February 28, 2008 11:51 PM
To: Tomcat Users List
Subject: Re: how to send http response in several chunked package with
Tomcat
//first flush headers
response.flushBuffer()
//then flush body
while (havedata) {
response.getOutputStream().println(some data)
response.flushBuffer()
}
you need to put your thinker hat on Hanks :)
Hanks Wang (hanwan) wrote:
> Hi Filip,
> Seems the method has a problem : tomcat puts the http header and part
> of the body in the same chunk.
>
> But I hope to generate the response in below format:
> Suppose I need use String tmp as the response, tmp = part1 + part2 +
> part3+part4;
> we use 4 tcp frame totally for the http response:
>
> Frame 1: only carry the httpheader, no chunk in the frame Frame 2:
> includes the first chunk, carries part1+part2; Frame 3: includes the
> second chunk, carries part3+part4; Frame 4: includes a chunk whose
> length is 0, tells client it's the end of chunks;
>
> However Tomcat generate the response in such way:
> Frame 1: includes httpheader and the first chunk, 1st chunk carries
> part1; Frame 2: includes part2 + part3;
> Frame3 and Frame4 are same with above;
>
> So how can I make sure there is only http header in the first frame?
>
> Thanks.
> Han
>
>
> -----Original Message-----
> From: Hanks Wang (hanwan)
> Sent: Thursday, February 28, 2008 10:26 PM
> To: Tomcat Users List
> Subject: RE: how to send http response in several chunked package with
> Tomcat
>
> Hi Filip,
>
> Yes it works. Thanks a lot!
>
> Christopher, in fact I'm writing a servlet to fool a management
> software, So I need make sure the servlet response is as close to real
> device as possible.
>
> Thanks for everyone's help.
>
> B.R
> Han
> -----Original Message-----
> From: Filip Hanik - Dev Lists [mailto:devlists@hanik.com]
> Sent: Wednesday, February 27, 2008 11:24 PM
> To: Tomcat Users List
> Subject: Re: how to send http response in several chunked package with
> Tomcat
>
> you don't need to do that, tomcat does it for you.
> all you need to do is
>
> while (havedata) {
> response.getOutputStream().println(some data)
> response.flushBuffer()
> }
>
> and tomcat takes care of the rest
>
> Filip
>
> Hanks Wang (hanwan) wrote:
>
>> Hi Johnny,
>>
>> I try below method implement the chunk in code:
>>
>> String tmp = "something very long";
>>
>> String hlen = Integer.toHexString(tmp.length());
>> hlen = hlen +"\r\n" + tmp.toString(); String chunkend =
>> Integer.toHexString(0)+"\r\n";
>> response.getOutputStream().println(hlen);
>> response.getOutputStream().println(chunkend);
>>
>> I created two http chunk successfully by this way. The first chunk is
>> the data which wraps tmp, the second is the end chunk.
>>
>> But the question is, all these chunk and http header are in same
>> frame
>>
>
>
>> (get it from wireshark.).
>>
>> How can I put them in different frame?
>> Which means we need 3 frame for the case: the first frame will carry
>> the http header, the second will carry the first chunk data, the last
>> frame will carry the end chunk.
>>
>> Does it mean I need control the tcp/ip protocol? It's impossible,
>>
> right?
>
>> B.R
>> Han
>>
>>
>>
>> -----Original Message-----
>> From: Hanks Wang (hanwan)
>> Sent: Wednesday, February 27, 2008 3:40 PM
>> To: Tomcat Users List
>> Subject: RE: how to send http response in several chunked package
>> with
>>
>
>
>> Tomcat
>>
>> Hi Johnny,
>>
>> Thanks a lot. I read the http RFC and find something like this:
>>
>> The chunk-size field is a string of hex digits indicating the size of
>> the chunk. The chunked encoding is ended by any chunk whose size is
>> zero, followed by the trailer, which is terminated by an empty line.
>>
>> Do u have any tutorial of ChunkedOutputFilter? I can't find anything
>> from its API document..
>>
>> Thanks
>> Han
>>
>>
>> -----Original Message-----
>> From: Johnny Kewl [mailto:john@kewlstuff.co.za]
>> Sent: Tuesday, February 26, 2008 7:41 PM
>> To: Tomcat Users List
>> Subject: Re: how to send http response in several chunked package
>> with
>>
>
>
>> Tomcat
>>
>>
>> ---------------------------------------------------------------------
>> -
>> --
>> ---
>> HARBOR: http://coolharbor.100free.com/index.htm
>> The most powerful application server on earth.
>> The only real POJO Application Server.
>> Making the Java dream come true.
>> ---------------------------------------------------------------------
>> -
>> --
>> ---
>> ----- Original Message -----
>> From: "Hanks Wang (hanwan)" <ha...@cisco.com>
>> To: "Tomcat Users List" <us...@tomcat.apache.org>
>> Sent: Tuesday, February 26, 2008 12:02 PM
>> Subject: how to send http response in several chunked package with
>> Tomcat
>>
>>
>> Hi all,
>>
>> Is there a way to make tomcat generate http response in
>> chunked-encoding style?
>>
>> suppose I have a file resp.log and I can parse it in byte[], how can
>> I
>>
>
>
>> send the byte array in several chunked package?
>>
>> --------
>> Hanks I have just started looking at this, so no expert but I did
>> notice
>>
>> ChunkedInputFilter,ChunkedOutputFilter....
>>
>> I think your answer is in setting a filter.... in normal Http I
>> notice
>>
>
>
>> that chunking happens automatically if header size ommited, but with
>> so much control of the socket I think you have to pump it thru a
>> filter and then there must be a way to say last chuck... and start
>> chuck...
>> Short of that one would have to set headers themselves and add
>> trailing 0's and end sequences, so I think those classes are specific
>> to http11
>>
>> .... a guess
>>
>> Any suggestion is welcome!
>>
>> Thanks
>> Han
>>
>>
>>
>> ---------------------------------------------------------------------
>> To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe,
>> e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>> ---------------------------------------------------------------------
>> To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe,
>> e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>> ---------------------------------------------------------------------
>> To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe,
>> e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>>
>>
>
>
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe,
> e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe,
> e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe,
> e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
>
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe,
e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
RE: Zero-pad the chunk length which generated by tomcat automatically
Posted by "Hanks Wang (hanwan)" <ha...@cisco.com>.
Hi Chunk,
I saw it, thank u very much!
-----Original Message-----
From: Caldarale, Charles R [mailto:Chuck.Caldarale@unisys.com]
Sent: Friday, February 29, 2008 2:55 PM
To: Tomcat Users List
Subject: RE: Zero-pad the chunk length which generated by tomcat
automatically
> From: Hanks Wang (hanwan) [mailto:hanwan@cisco.com]
> Subject: RE: Zero-pad the chunk length which generated by tomcat
> automatically
>
> So all I want to know is whether I can use some way to zero-pad the
> chunk-length which generated by tomcat.
I don't see any way to do so via configuration, but changing the
existing code would be simple. Look here:
org/apache/coyote/http11/filters/ChunkedOutputFilter.java
in the middle of the doWrite() method where it's filling in the
chunkLength array.
- Chuck
THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
MATERIAL and is thus for use only by the intended recipient. If you
received this in error, please contact the sender and delete the e-mail
and its attachments from all computers.
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe,
e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
RE: Zero-pad the chunk length which generated by tomcat automatically
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: Hanks Wang (hanwan) [mailto:hanwan@cisco.com]
> Subject: RE: Zero-pad the chunk length which generated by
> tomcat automatically
>
> So all I want to know is whether I can use some way to zero-pad the
> chunk-length which generated by tomcat.
I don't see any way to do so via configuration, but changing the
existing code would be simple. Look here:
org/apache/coyote/http11/filters/ChunkedOutputFilter.java
in the middle of the doWrite() method where it's filling in the
chunkLength array.
- Chuck
THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
MATERIAL and is thus for use only by the intended recipient. If you
received this in error, please contact the sender and delete the e-mail
and its attachments from all computers.
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
RE: Zero-pad the chunk length which generated by tomcat automatically
Posted by "Hanks Wang (hanwan)" <ha...@cisco.com>.
Hi Chuck,
Maybe I used a improper word here. I know the spec doesn't say the
chunk-size has to be zero-pad to eight bytes.
But unfortunately there is such a case indeed and the real device sends
all chunk with chunk-size zero-filled.
And I need simulate the device and send the same response as the real
one.
So all I want to know is whether I can use some way to zero-pad the
chunk-length which generated by tomcat.
Thanks
Han
-----Original Message-----
From: Caldarale, Charles R [mailto:Chuck.Caldarale@unisys.com]
Sent: Friday, February 29, 2008 2:29 PM
To: Tomcat Users List
Subject: RE: Zero-pad the chunk length which generated by tomcat
automatically
> From: Hanks Wang (hanwan) [mailto:hanwan@cisco.com]
> Subject: Zero-pad the chunk length which generated by tomcat
> automatically
>
> In real world, the chunk-size will be "zero-pad" until 8 bytes.
Where in the HTTP RFC do you find any requirement to zero-fill the
chunk-size to eight bytes? The spec defines chunk-size as one or more
HEX digits, nothing more.
I'm curious: what "real-world" client are you using that hasn't
implemented that part of the RFC properly?
- Chuck
THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
MATERIAL and is thus for use only by the intended recipient. If you
received this in error, please contact the sender and delete the e-mail
and its attachments from all computers.
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe,
e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
RE: Zero-pad the chunk length which generated by tomcat automatically
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: Hanks Wang (hanwan) [mailto:hanwan@cisco.com]
> Subject: Zero-pad the chunk length which generated by tomcat
> automatically
>
> In real world, the chunk-size will be "zero-pad" until 8 bytes.
Where in the HTTP RFC do you find any requirement to zero-fill the
chunk-size to eight bytes? The spec defines chunk-size as one or more
HEX digits, nothing more.
I'm curious: what "real-world" client are you using that hasn't
implemented that part of the RFC properly?
- Chuck
THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
MATERIAL and is thus for use only by the intended recipient. If you
received this in error, please contact the sender and delete the e-mail
and its attachments from all computers.
---------------------------------------------------------------------
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org