Call Web Service using proxy and http authentication

[Steve Howell]

On May 12, 12:51 pm, wdveloper <tot... at gmail.com> wrote:
> On May 12, 8:38 pm, Steve Howell <showel... at yahoo.com> wrote:
>
>
>
> > On May 12, 8:59 am, wdveloper <tot... at gmail.com> wrote:
>
> > > Hi everyone,
>
> > > I am trying to call a webservice which requires an http
> > > authentication.
> > > To reach the ws, I must pass from a proxy http. So in the whole I need
> > > go through two authentications before getting the ws working. I am
> > > using SOAPpy and I'm getting quite crazy.
> > > I am able to arrange this problem with simple http calls using urllib2
> > > but for the ws i dont see any way out.
>
> > > Does anyone knows how I can manage this stuff? Is there any better
> > > solution or example code?
>
> > Your high level description of the problem is good, but I think you'll
> > get more help if you provide a little more detail.
>
> > For something like this you may want to try to do more at the HTTP
> > level, where you have a little more control over the authentication,
> > and then find a way to hook into SOAPpy just to build and parse the
> > payloads.
>
> > How good is your understanding of HTTP?  Do you know the basics of how
> > headers work?  You might want to brush up a little on HTTP just to
> > help understand what's going on; it will almost certainly be valuable
> > for future projects as well.
>
> > To understand how the proxy works in particular, if you can use the
> > proxy to access a normal html-serving website, you can use the "Live
> > HTTP Headers" tool under Firefox to see what's going on.
>
> > But before all that, I would maybe just post a little more detail on
> > the problem.  Maybe show code you've written so far, and any error
> > messages/tracebacks, to better indicate where you are stuck.
>
> Thank you very much Steve,
>
> I do have a good understanding of http and its headers rules, and of
> course I can work on that.
> On the other hand, I am new to python and SOAPpy toolkit and I dont
> have much of an experience working with ws in general.
>
> When it comes of working with simple call to WS, everything is
> successfull; problems start cause I dont know how to use the toolkit
> to compose the http request. I should code it in the way that it
> connects to my proper proxy and it gets authenticated in the server
> exposing the service.
>
> What I have is something like:
> from SOAPpy import WSDL
>
> wsdl = 'http://myws?wsdl'
> my_http_proxy = '10.x.x.x:8080'
> proxy = WSDL.Proxy(wsdl, http_proxy=my_http_proxy)
> res = proxy.myService( myparam='...' )
>
> What I get is that connection reaches timeout since the server doesnt
> see me coming from the right proxy.
> First problem, I can't see where I can put my proxy authentication
> username and password.
> Second, when I will be able to pass through the right proxy, I need to
> authenticate on the server via http through my credential.
>


Have you looked at the URLopener class?