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My question may first of all seem to have a duplicate but i have hit something that has suprised me. Yaws Webserver comes with a complete set SOAP example, but when i tried running it as is, this is what i get: enter image description here

In text form, this is what i see in the shell:

1> inets:start().
ok
2> yaws_soap_lib:call("http://www.webservicex.net/WeatherForecast.asmx?WSDL","GetWeatherByPlaceName",["Boston"]).

=ERROR REPORT==== 15-Apr-2013::20:32:11 ===
Call to tuple fun {erlsom_parse,xml2StructCallback}.
Tuple funs are deprecated and will be removed in R16. Use "fun M:F/A" instead, for example "fun erlsom_parse:xml2StructCallback/2".
(This warning will only be shown the first time a tuple fun is called.)
{error,{decoding,"Malformed: Illegal character in prolog"}}

3> yaws_soap_lib:call("http://www.webservicex.net/WeatherForecast.asmx?WSDL","GetWeatherByPlaceName",["Boston"]).
{error,{decoding,"Malformed: Illegal character in prolog"}}
4>


You could try the yaws example following this page.
Another problem, is that i have tried other SOAP libraries like detergent and erlsoap and they are either too old or completely un-usable. Most of the solutions, even yaws, mentions his dependency on erlsom i pretty think for the XML parsing. But, i can hardly use erlsom single-handedly to offer soap services.

Somebody provide some information on how i can work with soap services (both a sa client and server) in erlang, and please explain the error i am getting with yaws. I am using the latest yaws version and erlang 15B.
Muzaaya Joshua
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  • I'm also playing with Erlang and SOAP right now. I have some problems with my own WS, but the Weather example worked out of the box. I'm using Erlang R15B02 and Yaws 1.94 on Linux. – Wacław Borowiec Apr 15 '13 at 19:09
  • let me change yaws version and see. Probably also because i am using Windows 7 – Muzaaya Joshua Apr 16 '13 at 05:15
  • still getting the same problem with `yaws-1.94`. Let me shift to linux and see the outcome. But, with R15B02, where you also getting the `fun` warning ? – Muzaaya Joshua Apr 16 '13 at 05:41

2 Answers2

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This is an ugly hack, but here's how I deal with SOAP requests:

Write a function/module that wraps the following:

  1. Set up some request templates (static XMLs) and fill them up with erlydtl
  2. Make a HTTP POST request (using your client of choice) with SoapAction header set.
  3. Take off the important stuff from the response using erlsom
Ragnar Lodbrok
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  • true ! this works !. Thank you. I used `erlsom SAX` parsing to get out what i need from the requests. And i can construct the soap response back to the clients. – Muzaaya Joshua Apr 18 '13 at 04:53
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From the official documentation we can read the following:

Tuple funs (a two-element tuple with a module name and a function) are now officially deprecated and will be removed in R16. Use 'fun M:F/A' instead.

So, Yaws should be updated. As a workaround, you have at least two options:

  1. the Detergent library
  2. Or, if you don't mind using the (not so) older Erlang R15, I believe it should work, as other users reported.
Carlo
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