Hi Traffic Server Gurus,
Would appreciate some help here -- How can I access the underlying string or
char* for the body of the server response?
There are many functions for working with server response headers -
including URL, mime type, etc, but I see nothing for the body itself.
I am trying to write a plugin with behavior that depends on the body of the
response from the http server.
Thanks,
Manish
How do I access the actual string or char*
> representing the body here? The data seems to be hidden below a few
levels
> of buffers and abstractions:
>
> if (towrite > 0) {
> /* Copy the data from the read buffer to the output buffer. */
> if (TSIOBufferCopy(TSVIOBufferGet(data->output_vio),
> TSVIOReaderGet(input_vio), towrite, 0) == TS_ERROR) {
> TSError("[null-plugin] unable to copy IO buffers\n");
> goto Lerror;
> }
On Tue, Nov 30, 2010 at 7:14 AM, Manish Pandey <[email protected]>
wrote:
> Hi Eric,
> Thanks for the pointers.
>>1. With a transformation plugin you could 'print' the full response -- but
>> where do you want to print it?
> I'd like to print it as a debug message to stdio/stderr on the window in
> which the program is running, and check on the transformations that are
> applied to it.
> 2. The null-transform plugin can be the basis of the plugin I want to
> develop, but a couple of questions. Here is the code snippet which seems
to
> do the actual copying. How do I access the actual string or char*
> representing the body here? The data seems to be hidden below a few
levels
> of buffers and abstractions:
>
> if (towrite > 0) {
> /* Copy the data from the read buffer to the output buffer. */
> if (TSIOBufferCopy(TSVIOBufferGet(data->output_vio),
> TSVIOReaderGet(input_vio), towrite, 0) == TS_ERROR) {
> TSError("[null-plugin] unable to copy IO buffers\n");
> goto Lerror;
> }
>
> Thanks,
> Manish
> On Sun, Nov 28, 2010 at 10:47 PM, Eric Balsa <[email protected]> wrote:
>>
>> Hi Manish,
>>
>> 1. With a transformation plugin you could 'print' the full response --
>> but where do you want to print it?
>>
>> 2. There is no HTML parsing inside TrafficServer. TS does not care
>> about content; it proxies/caches *anything* as long as it's served
>> over HTTP/HTTPS.
>>
>> To solve your problem, you would need to develop a transformation
>> plugin
>> (
http://trafficserver.apache.org/docs/v2/sdk/HTTPTransformationPlugins.html)
>> and do some simple string parsing on the buffer.
>>
>> There are a few plugin examples available to get you started at:
>>
>>
http://svn.apache.org/repos/asf/trafficserver/traffic/trunk/example/null-transform/
>>
>>
http://svn.apache.org/repos/asf/trafficserver/traffic/trunk/example/bnull-transform/
>>
>>
http://svn.apache.org/repos/asf/trafficserver/traffic/trunk/example/append-transform/
>>
>> Regards,
>> --Eric
>>
>> On Sun, Nov 28, 2010 at 9:05 PM, Manish Pandey <[email protected]>
wrote:
>> > Hi folks,
>> >
>> > I am developing a trafficserver plugin, and would like to find out
>> > 1. How can I print a origin server response sent to the trafficserver,
>> > e.g.,
>> > the html document with embedded javascript etc.
>> > 2. Also, how can I detect specific strings in the response to do
>> > response
>> > filtering? Is there any html parser that is available
>> > in TS that I can use for this?
>> >
>> > Any pointers will be appreciated.
>> >
>> > Thanks,
>> > Manish
>> >
>
>
