>
> On Sat, Nov 13, 2010 at 3:32 AM, qjmann<[email protected]
> <mailto:[email protected]>> wrote:
> > Documentation contains example HTTP client, but I see it works in blocking
> > mode:
> >
> > http_client::response response = client.get(request)
> >
> > - this call will stop program execution while waiting for server's
> > response.
>
> Not if http_client is a typedef like:
>
> typedef boost::network::http::basic_client<
> boost::network::http::tags::http_async_8bit_udp_resolve
> , 1, 0> http_client;
>
> > Is it possible to perform multiple concurrent requests with cpp_netlib
> > without spawning multiple threads, as it can be done with ASIO asynchronous
> > sockets?
>
> Yes, use the asynchronous tags for the http_client. This will use
> futures underneath.
>
> In a later release there will be a change in the interface for an
> asynchronous HTTP client that will take in a function to handle
> incoming data from a request -- most probably will follow the same
> interface that the async HTTP server in 0.8-devel will, I still
> haven't decided yet.
>
> >
> > 1) Create single io_service object
> > 2) Create and initialize client objects set (all attached to io_service
> > object just created)
> > 3) Call io_service.poll()
> > 4) Check client objects for responses received
> > 5) If some responses has not been received yet, then goto step 3
> >
>
> No need for polling really, a callback mechanism or the current
> futures-based implementation should suffice for most cases.
>
> HTH
>
> --
> Dean Michael Berris
> deanberris.com
>
Thank's a lot, I used asynchronous tags, and now "client.get(request)"
call is not blocking progpam's execution.
In my application there will be a huge queue of URLs (from different
hosts, it is just a crawler) and very limited set of requester objects
(app must handle ~100 concurrent connections). So I want to implement a
loop:
while(/* queue has urls */) {
for(/* loop through client objects set */)
if(/* client[i] received the whole response */) {
/* get response body */
/* get new URL from queue */
/* set new URL for client[i] request */
/* client[i].get(request) */
}
}
So, next trouble is how to check if client[i] has received the whole
response and disconnected from server ("Connection: close" request
header was used) or not. How to check this? And additionally, how to
pass callback handlers into client (or response maybe?) object?
I have found nothing about this in documentation and in examples also.
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