[erlang-questions] Parsing custom HTTP headers with inet, [{active, false},{packet, http_bin}, ...]

zabrane Mikael <>
Sat Aug 28 12:46:04 CEST 2010


Hi Tony,

2010/8/28 Tony Rogvall <>:
> What  version of OTP are you using?

I'm under OSX Snow Leopard:
$ erl
Erlang R13B04 (erts-5.7.5) [source] [smp:2:2] [rq:2] [async-threads:0]
[kernel-poll:false]

Eshell V5.7.5  (abort with ^G)
1>


> Try:
>> erlang:decode_packet(httph, <<"X-WEBARCH-RESOURCE-UUID: 123456789\r\n\r\n">>, []).
>
> Return value should be:
>
> {ok,{http_header,0,"X-WEBARCH-RESOURCE-UUID",undefined,
>                 "123456789"},
>    <<"\r\n">>}

Got the same result as you:
1> erlang:decode_packet(httph, <<"X-WEBARCH-RESOURCE-UUID:
123456789\r\n\r\n">>, []).
{ok,{http_header,0,"X-WEBARCH-RESOURCE-UUID",undefined,
                 "123456789"},
    <<"\r\n">>}

"httph_bin" works fine too:
2> erlang:decode_packet(httph_bin, <<"X-WEBARCH-RESOURCE-UUID:
123456789\r\n\r\n">>, []).
{ok,{http_header,0,<<"X-WEBARCH-RESOURCE-UUID">>,undefined,
                 <<"123456789">>},

> If this works,  then the problem is probably somewhere else.

Do you think it's related to my socket options?

> tcp-dump?

Hmm ... I'm pretty sure that "curl" sent the headers correctly. I can
see them with debug "on":

$ curl -v -D - -x localhost:9876 -H 'X-ARCHWEB-RESOURCE-UUID:
123456789' --url http://www.foo.com
* About to connect() to proxy 127.0.0.1 port 8080 (#0)
*   Trying 127.0.0.1...   % Total    % Received % Xferd  Average Speed
  Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
^M  0     0    0     0    0     0      0      0 --:--:-- --:--:--
--:--:--     0connected
* Connected to 127.0.0.1 (127.0.0.1) port 8080 (#0)
> GET http://www.lemonde.fr HTTP/1.0
> User-Agent: curl/7.20.0 (i386-apple-darwin10.3.0) libcurl/7.20.0 OpenSSL/0.9.8o zlib/1.2.5 libidn/1.19
> Host: www.foo.com
> Accept: */*
> Proxy-Connection: Keep-Alive
> X-WEBARCH-RESOURCE-UUID: 123456789
...

-- 
Regards
Zabrane


>
> /Tony
>
>
> On 28 aug 2010, at 12.11, zabrane Mikael wrote:
>
>> Hi,
>>
>> I'm facing a strange problem to parse custom HTTP headers in my server
>> code which looks like:
>>
>> {ok, ListenSocket} = gen_tcp:listen(9876, [binary, inet, {active,
>> false},  {packet, http_bin}, {reuseaddr, true}]),
>> ...
>> headers(Socket) ->
>>    ok = inet:setopts(Socket, [{active, once}]),
>>    receive
>>         ...
>>        {http, _, {http_header, _, Header, _, Val}} ->
>>            io:format("---> The header is: ~p: ~p~n", [Header, Val]),
>>
>> Trying to send the following custom header "X-ARCHWEB-RESOURCE-UUID"
>> works fine, and the custom header appears
>> correctly in my server code:
>> $ curl -x localhost:9876 -H 'X-ARCHWEB-RESOURCE-UUID: 123456789' --url
>> http://www.foo.com
>>
>> 1> ...
>> ---> The header is: <<"X-ARCHWEB-RESOURCE-UUID">>: <<"123456789">>
>>
>> But changing a bit the custom header name to "X-WEBARCH-RESOURCE-UUID"
>> doesn't work
>> and the server don't even print it out (i.e nothing is received).
>>
>> Now, trying with "X-WEBARCH-RESOURC-UUID" (notice the missing "E" at
>> the end of "RESOURC") works fine:
>>
>> 2> ...
>> ---> The header is: <<"X-WEBARCH-RESOURC-UUID">>: <<"123456789">>
>>
>> Even bad, trying with "X-WEBARCH-RESOURCE" completely alter the
>> letters cases (first letter is capital letter and the rest is
>> lowercase):
>>
>> 3>
>> ---> The header is: <<"X-Webarch-Resource">>: <<"123456789">>
>>
>> Could someone tell me what am I doing wrong?
>> Is there any option to tell "inet" to not alter the headers at all?
>>
>> --
>> Regards
>> Zabrane
>>
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