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Jose,
On 2/27/14, 3:22 PM, Christopher Schultz wrote:
> 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.
You may be interested in this thread from 2009:
http://markmail.org/thread/fumpfuspt7a3nesz
- -chris
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