FYI -- the http standard says that content-length *must* be removed for a
compressed response --
Messages MUST NOT include both a Content-Length header field and a
non-identity transfer-coding. If the message does include a non- identity
transfer-coding, the Content-Length MUST be ignored.
See http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.4
Benno
On Mon, May 14, 2012 at 9:56 AM, John Caron <caron@xxxxxxxxxxxxxxxx> wrote:
> On 5/13/2012 1:16 AM, Ethan Davis wrote:
>
>> Hi Patrick,
>>
>> What is the version of the TDS with which you are trying to synch? The
>> TDS has supported lastModified for quite some time, so it would have to
>> be a pretty old version to not support it. But that's the first thing
>> that comes to mind.
>>
>> You could also try looking at the HTTP "Last-Modified" response headers
>> you are getting back. You can do this with the wget "--save-headers"
>> option. Or, in Firefox, by using a plugin like Live HTTP Headers.
>>
>> John, any chance the file caching in the TDS could be masking a change
>> to the last modified timestamp?
>>
>
> Last-Modified works correctly.
>
> We set Content-Length correctly, but Tomcat removes it when it compresses,
> since its wrong. I assume thats the problem. The headers of a typical
> request look like:
>
> Request Headers =
>
> Accept-Encoding: gzip,deflate
> User-Agent: ToolsUI v4.3
> Host: localhost:8080
>
> Status = 200 HTTP/1.1 200 OK
> Status Line = HTTP/1.1 200 OK
> Response Headers =
> Server: Apache-Coyote/1.1
> Last-Modified: Fri, 30 Oct 2009 06:00:00 GMT
> Accept-Ranges: bytes
> Content-Type: application/octet-stream
> Transfer-Encoding: chunked
> Content-Encoding: gzip
> Vary: Accept-Encoding
> Date: Sat, 12 May 2012 20:52:12 GMT
>
> I realize as I look at this that if wget doesnt do an Accept-Encoding:
> gzip,deflate then compression is turned off, and the content-length should
> work. Can someone capture the request and see what the headers are?
>
>
> John
>
> ______________________________**_________________
> thredds mailing list
> thredds@xxxxxxxxxxxxxxxx
> For list information or to unsubscribe, visit:
> http://www.unidata.ucar.edu/**mailing_lists/<http://www.unidata.ucar.edu/mailing_lists/>
>
--
Dr. M. Benno Blumenthal benno@xxxxxxxxxxxxxxxx
International Research Institute for climate and society
The Earth Institute at Columbia University
Lamont Campus, Palisades NY 10964-8000 (845) 680-4450
