sending multiple response from a servlet

spartacus · Feb 7, 2005

Hi,

Basically I want to solve a timeout problem, where server closes
connection when it has to wait for a long time to retrieve data from
db. I wanted to send some
blank( or status) value to the client browser so that it stay alive.

Any idea how this can be done? Read some where that, only one reponse
can be sent back from a request. trying out with threads and fails to
submit more than one response.

please give some pointers

-regards.

Antti S. Brax · Feb 7, 2005

Basically I want to solve a timeout problem, where server closes
connection when it has to wait for a long time to retrieve data from
db. I wanted to send some
blank( or status) value to the client browser so that it stay alive.

please give some pointers

Increase server's timeout value or make the DB operation less
complex (possibly by breaking it up into multiple operations).

Solving problems by adding kludgery should be your last resort.

Andrea Desole · Feb 7, 2005

spartacus said:
Any idea how this can be done? Read some where that, only one reponse
can be sent back from a request. trying out with threads and fails to
submit more than one response.

according to the HTTP specs, you can send more than one informational
responses:

http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.1

This might work, but I don't know if you can do that from a servlet; I
think there might be a problem after you flush the buffer, because the
response is committed and it doesn't take other changes, which means you
can't send the second one.
But it can be a solution.
Or you can send a new request from the client side, reloading the page
every n seconds.

Heiner Kücker · Feb 7, 2005

Andrea Desole wrote

according to the HTTP specs, you can send more than one informational
responses:

http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.1

This might work, but I don't know if you can do that from a servlet; I
think there might be a problem after you flush the buffer, because the
response is committed and it doesn't take other changes, which means you
can't send the second one.
But it can be a solution.
Or you can send a new request from the client side, reloading the page
every n seconds.

To send a new request form your client browser is useful the meta refresh:

<head>
<title>Title</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="refresh" content="0; URL=http://www.xxx.com/servlet">
</head>

--
Heiner Kuecker
Internet: http://www.heinerkuecker.de http://www.heiner-kuecker.de
JSP WorkFlow PageFlow Page Flow FlowControl Navigation: http://www.control-and-command.de
Java Expression Formula Parser: http://www.heinerkuecker.de/Expression.html
CnC Template Technology http://www.heinerkuecker.de/Expression.html#templ
Domain Specific Languages http://www.heinerkuecker.de/DomainParser.html

spartacus · Feb 7, 2005

Heiner said:
Andrea Desole wrote

To send a new request form your client browser is useful the meta refresh:

<head>
<title>Title</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="refresh" content="0; URL=http://www.xxx.com/servlet">
</head>

--
Heiner Kuecker
Internet: http://www.heinerkuecker.de http://www.heiner-kuecker.de
JSP WorkFlow PageFlow Page Flow FlowControl Navigation: http://www.control-and-command.de
Java Expression Formula Parser: http://www.heinerkuecker.de/Expression.html
CnC Template Technology http://www.heinerkuecker.de/Expression.html#templ
Domain Specific Languages

http://www.heinerkuecker.de/DomainParser.html

Thank you everyone for their valuable inputs.

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sending multiple response from a servlet

spartacus

Antti S. Brax

Andrea Desole

Heiner Kücker

spartacus

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