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From S Ahmed <sahmed1...@gmail.com>
Subject Re: clarification on how data is streamed and handled by tomcat
Date Wed, 04 Jan 2012 18:47:14 GMT
Tomcat 6
Spring MVC, where my controllers method has both httpservletrequest and
httpservletresponse as parameters.

The point is that I want to know the effects of others sending me large
values in a http post (not an image upload, but a form post).

I'm assuming once it is sent by the client as a http post, and my servlet
responds to the request tomcat has already streamed that data and whether I
do:

String p1 = request.getParameter("big_payload")

or not, it has already been loaded into memory.

Am I correct?

Is there a maximize size setting in tomcat?

On Wed, Jan 4, 2012 at 1:03 PM, Konstantin Kolinko
<knst.kolinko@gmail.com>wrote:

> 2012/1/4 S Ahmed <sahmed1020@gmail.com>:
> > Say I have a simple servlet or spring mvc application running on tomcat.
> >
> > Tomcat is running as a webserver on port 80.
> >
> > A client makes a http POST request to my page www.example.com/submit
> >
> > If the client adds a very large file with the POST, does this mean that
> > when my servlet code starts to execute, tomcat already has the entire
> > request content in memory? (including the very large POST parameter)
>
> 1. Tomcat version =?
> 2. What API are you using to read the file?
>
> In general request processing starts after the headers in HTTP request
> have been read. At that point you can call getInputStream() and read
> the body of the POST request while it is being received from the
> client.
>
> But if you call certain APIs (e.g. getParameter()) the call will hang
> until entire POST request body is received from the client and
> processed. It is said that those methods "consume" the body of a POST
> request.
>
> 3. In most implementations large file uploads are not stored in
> memory, but are written to a temporary file on your hard drive. (So
> the request body is processed, but you cannot say that it is "in
> memory").
>
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