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Jose,
On 2/27/14, 1:29 PM, Jose María Zaragoza wrote:
> 2014-02-27 17:24 GMT+01:00 Konstantin Kolinko
> <knst.koli...@gmail.com>:
>> 2014-02-27 18:31 GMT+04:00 Jose María Zaragoza
>> <demablo...@gmail.com>:
>>>
>>> And what do you recommend to me for forcing to return a
>>> Content-Type ? Some weird clients require it
>>>
>>> If I cannot do it with a Filter , where can I do it ?
>>>
>>
>> You can do it in a Filter.
>>
>> As I said, 1. The header must be set before writing anything to
>> the output stream. That is per HTTP/1.1 protocol. 2. The header
>> must have correct value.
>>
>> How to implement that is up to you (do not expect me to teach you
>> java programming, but maybe others here will do).
>>
>> If you do not know the length before response is generated, a
>> solution can be to buffer the response before writing it out.
>>
>> Buffering can be done by writing an adapter around servlet
>> response that replaces default output stream with a buffered one.
>> The adapter can be implemented by extending
>> javax.servlet.http.HttpServletResponseWrapper class. Some
>> caching frameworks have filters that perform such buffering and
>> caching.
>
>
> Thanks. Finally, I did it with a servlet and it works
>
> I tried with a Filter and a HttpServletResponseWrapper. Long time
> before asking here. And I wrapped the response output stream into a
> FilterOutputStream , so I could count every byte written I got the
> right content length . All OK and I was happy. But , when I tried
> set the header with wrapper.setHeader("Content-Length", count ) ,
> and as you told me before, the response headers had already been
> flushed ( i checked isCommited() ) I could modify output stream
> data but I couldn't modify response headers. I don't understand but
> it is
Don't forget that you actually need to buffer the data. You can't just
wrap the container's OutputStream (or Writer) in a FilterOutputStream
- -- the bytes will flow through your stream (writer) back to the client
while you are counting them.
If you aren't using a big byte array (or something similar), then you
aren't buffering.
- -chris
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