I'm trying to understand how async callbacks are possible with web services
since they use HTTP (which is stateless) for their communication protocol.
What happens under the covers to allow services to perform callbacks when
they're complete?
Thanks for your help.
13  1334 
Web Developer wrote: I'm trying to understand how async callbacks are possible with web services
since they use HTTP (which is stateless) for their communication protocol.
What happens under the covers to allow services to perform callbacks when
they're complete?
Thanks for your help.
What allows a web page to be sent back to your browser when you enter a
URL in the location?
Web Developer wrote: I'm trying to understand how async callbacks are possible with web services
since they use HTTP (which is stateless) for their communication protocol.
What happens under the covers to allow services to perform callbacks when
they're complete?
Thanks for your help.
What allows a web page to be sent back to your browser when you enter a
URL in the location?
Responding to a question with a question doesn't quite answer it. Can you
provide any low-level details about how it works?
It seems like the client must be opening a TCP connection (on port 80) that
stays open. Is that right? If so, in the async communication, how does the
web server know when to close the connection?
Thanks.
"John Bailo" wrote: Web Developer wrote: I'm trying to understand how async callbacks are possible with web services
since they use HTTP (which is stateless) for their communication protocol.
What happens under the covers to allow services to perform callbacks when
they're complete?
Thanks for your help.
What allows a web page to be sent back to your browser when you enter a
URL in the location?
Responding to a question with a question doesn't quite answer it. Can you
provide any low-level details about how it works?
It seems like the client must be opening a TCP connection (on port 80) that
stays open. Is that right? If so, in the async communication, how does the
web server know when to close the connection?
Thanks.
"John Bailo" wrote: Web Developer wrote: I'm trying to understand how async callbacks are possible with web services
since they use HTTP (which is stateless) for their communication protocol.
What happens under the covers to allow services to perform callbacks when
they're complete?
Thanks for your help.
What allows a web page to be sent back to your browser when you enter a
URL in the location?
Web Developer wrote: Responding to a question with a question doesn't quite answer it. Can you
provide any low-level details about how it works?
It seems like the client must be opening a TCP connection (on port 80) that
stays open. Is that right?
You just said it was /stateless/.
If so, in the async communication, how does the
web server know when to close the connection?
Thanks.
"John Bailo" wrote:
Web Developer wrote:
I'm trying to understand how async callbacks are possible with web services
since they use HTTP (which is stateless) for their communication protocol.
What happens under the covers to allow services to perform callbacks when
they're complete?
Thanks for your help.
What allows a web page to be sent back to your browser when you enter a
URL in the location?
Web Developer wrote: Responding to a question with a question doesn't quite answer it. Can you
provide any low-level details about how it works?
It seems like the client must be opening a TCP connection (on port 80) that
stays open. Is that right?
You just said it was /stateless/.
If so, in the async communication, how does the
web server know when to close the connection?
Thanks.
"John Bailo" wrote:
Web Developer wrote:
I'm trying to understand how async callbacks are possible with web services
since they use HTTP (which is stateless) for their communication protocol.
What happens under the covers to allow services to perform callbacks when
they're complete?
Thanks for your help.
What allows a web page to be sent back to your browser when you enter a
URL in the location?
John,
I have no idea what your statement means, but it's not an answer.
Can anyone else describe what happens when an async callback is made from a
web service?
Thanks.
John,
I have no idea what your statement means, but it's not an answer.
Can anyone else describe what happens when an async callback is made from a
web service?
Thanks.
If I'm not mistaken, an async call to a web service all happens on the client
side - basically a thread is spawned on the client side to invoke the web
service via the thread pool and when the thread completes the web service
call, it invokes you callback.
HTH
--
Dave Stienessen
"Web Developer" wrote: John,
I have no idea what your statement means, but it's not an answer.
Can anyone else describe what happens when an async callback is made from a
web service?
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