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| Guest |
 Posted: Mon Apr 07, 2008 10:49 am |
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Guest
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Hi,
I'm trying out the httpd of inets using the Erl Scheme Interface in
R12B. But I don't quite understand how the mod_esi:deliver() mechanism
works. I appear to get no response back from the httpd when using it.
My trivial test module is this:
-module(test01).
-export([start/0, stop/1, test1/2, test2/3]).
start() ->
case application:get_application(inets) of
{ok, inets} ->
ok;
undefined ->
ok = inets:start()
end,
{ok, Pid} = inets:start(httpd, [
{port, 8989},
{server_name,"httpd_test"},
{server_root,"."},
{document_root,"."},
{bind_address, "localhost"},
{modules, [mod_log, mod_esi]},
{log_format, common},
{error_log, "error.log"},
{security_log, "security.log"},
{transfer_log, "transfer.log"},
{erl_script_alias, {"/example", [test01]}},
{erl_script_nocache, true}
]),
Pid.
stop(Pid) ->
ok = inets:stop(httpd, Pid).
test1(Env, Input) ->
io_lib:format("Content-Type:
text/plain\r\n\r\nTEST1\r\n\r\n~p\r\n\r\n~p\r\n", [Env, Input]).
test2(SessionID, Env, Input) ->
mod_esi:deliver(SessionID, "Content-Type: text/plain\r\n\r\n"),
mod_esi:deliver(SessionID,
io_lib:format("TEST2\r\n\r\n~p\r\n\r\n~p\r\n", [Env, Input])).
And http://localhost:8989/example/test01:test1?BlaBla gives me the
anticipated response, but
http://localhost:8989/example/test01:test2?SomethingElse does not
return any response at all. Both GETs are shown in the transfer log,
no errors as far as I can see.
Do I need to deliver some kind of EOF?
Thanks for all pointers,
Robby
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| Guest |
| Posted: Mon Apr 07, 2008 12:40 pm |
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Guest
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| Guest |
| Posted: Mon Apr 07, 2008 1:27 pm |
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Guest
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On 4/7/08, Kyösti Ranto <kranto@gmail.com> wrote:
> Accoring to the documentation, the second argument of deliver/2 can be
> either of type string() or io_list(). I don't know about the latter
> but you can convert your parameter to string() by calling
> lists:flatten(), i.e.
>
> lists:flatten(io_lib:format(...))
Ha! That did it, mod_esi:deliver() works with flat strings.
Thanks,
Robby
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| Guest |
| Posted: Mon Apr 07, 2008 2:59 pm |
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Guest
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I poked around the sources of httpd a bit (R12B). and found
http_transport:send/3 :
%%-------------------------------------------------------------------------
%% send(RequestOrSocketType, Socket, Message) -> ok | {error, Reason}
%% SocketType = ip_comm | {ssl, _}
%% Socket = socket()
%% Message = list() | binary()
%% Description: Sends a packet on a socket, using either gen_tcp or ssl.
%%-------------------------------------------------------------------------
send(ip_comm, Socket, Message) ->
gen_tcp:send(Socket, Message);
send({ssl, _}, Socket, Message) ->
ssl:send(Socket, Message).
There's a small issue here, in that gen_tcp:send/2 takes a [char()] or
binary() as its second argument, whereas ssl:send/2 takes iolist() or
binary().
I think this is what causes iolist() arguments to mod_esi:deliver/2 to
not work under the ip_comm connection type.
Robby
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| Guest |
| Posted: Tue Apr 08, 2008 6:57 am |
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Guest
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On 4/7/08, Ky?sti Ranto <kranto@gmail.com> wrote:
> > Accoring to the documentation, the second argument of deliver/2 can be
> > either of type string() or io_list(). I don't know about the latter
> > but you can convert your parameter to string() by calling
> > lists:flatten(), i.e.
> >
> > lists:flatten(io_lib:format(...))
>
> Ha! That did it, mod_esi:deliver() works with flat strings.
No that is not entirely true. The data can be a string() or an io_list() but
if you want to send http-header data it has to be a string. From the documentation:
"Sends data from a Erl Scheme script back to the client. Note
that if any HTTP-header fields should be added by the
script they must be in the first call to deliver/2 and the
data in the call must be a string."
Regards Ingela - OTP team
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| wuji |
| Posted: Mon Aug 20, 2012 8:13 am |
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User
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Posts: 654
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