Re: HTTP Request Header & Data Handling

[Darin Fisher]

I presume that by "user parameters" you mean the form post parameters, 
either encoded in the URL or encoded as the body of the request 
message.  In the former case you cannot really change what is sent to 
the server.  The URL for the HTTP channel is fixed.

However, in the latter case, it is probably possible to use 
nsIUploadChannel to change the nsIInputStream containing the data to be 
sent to the server.  This is known to work.

NOTE: With regards to URL params, I haven't tried modifying the URL of 
the HTTP channel from on-modify-request, but it might just be possible.  
However, it is a risky thing to do since so many things in the browser 
use it as a key.  I suppose you could try modifying it in 
on-modify-request to see what breaks (if anything):

You'd want to call nsIChannel::GetURI, QueryInterface the result to 
nsIURL, and then modify the "query" portion of the nsIURL (use GetQuery 
and SetQuery).  This should work ok except when the browser uses a proxy 
server, which just goes to show how risky and unsupported this hackery 
would be.  I'm sure other things would break too.

Don't say I didn't warn you! ;-)

-Darin

nitro wrote:

 > see nsIHttpChannel.  it inherits from nsIChannel, which inherits from

nsIRequest.

you can use nsIObserverService to hook your application up to receive 
notifications about HTTP requests and responses.  
nsIHttpProtocolHandler.idl documents these observer topics.

see the online xpcom book 
(http://www.mozilla.org/projects/xpcom/book/cxc/) for more info on 
using nsIObserverService to intercept various Gecko events.

if you have any questions, don't hesistate to ask.

-darin


Alright, but I don't understand how mozilla send parameters to HTTP 
servers. I mean there are two common ways to send informations :

1) GET for URLs
http://www.some-site.com/some-page.ext?param1=value1&param2=value2
HTTP request look like :
GET /some-page.ext?param1=value1&param2=value2 HTTP/1.X
...
2) POST for FORMs
http://www.some-site.com/some-page.ext and then there is something in 
request content.
HTTP request look like :
GET /some-page.ext HTTP/1.X
...
\n\n
====================someseparator============
param1=value1
====================someseparator============
param2=value2

I known all HTTP request fields are accessible like user-agent, 
referrer, host, ... But then for user-parameters can I access them the 
same way as common HTTP-parameters ?

I mean can I use nsIHTTPChannel::GetRequestHeader(...), 
nsIHTTPChannel::SetRequestHeader(...) and 
nsIHTTPChannel::VisitRequestHeaders(...) to check and then modify 
user-parameters ?

Regards

Nitro
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