Sending SOAP request using Python Requests

Question

Is it possible to use Python's requests library to send a SOAP request?

Answer 1

It is indeed possible.

Here is an example calling the Weather SOAP Service using plain requests lib:

import requests url="http://wsf.cdyne.com/WeatherWS/Weather.asmx?WSDL" #headers = {'content-type': 'application/soap+xml'} headers = {'content-type': 'text/xml'} body = """<?xml version="1.0" encoding="UTF-8"?>          <SOAP-ENV:Envelope xmlns:ns0="http://ws.cdyne.com/WeatherWS/" xmlns:ns1="http://schemas.xmlsoap.org/soap/envelope/"              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">             <SOAP-ENV:Header/>               <ns1:Body><ns0:GetWeatherInformation/></ns1:Body>          </SOAP-ENV:Envelope>"""  response = requests.post(url,data=body,headers=headers) print response.content 

Some notes:

• The headers are important. Most SOAP requests will not work without the correct headers. application/soap+xml is probably the more correct header to use (but the weatherservice prefers text/xml
• This will return the response as a string of xml - you would then need to parse that xml.
• For simplicity I have included the request as plain text. But best practise would be to store this as a template, then you can load it using jinja2 (for example) - and also pass in variables.

For example:

from jinja2 import Environment, PackageLoader env = Environment(loader=PackageLoader('myapp', 'templates')) template = env.get_template('soaprequests/WeatherSericeRequest.xml') body = template.render() 

Some people have mentioned the suds library. Suds is probably the more correct way to be interacting with SOAP, but I often find that it panics a little when you have WDSLs that are badly formed (which, TBH, is more likely than not when you're dealing with an institution that still uses SOAP ;) ).

You can do the above with suds like so:

from suds.client import Client url="http://wsf.cdyne.com/WeatherWS/Weather.asmx?WSDL" client = Client(url) print client ## shows the details of this service  result = client.service.GetWeatherInformation()  print result  

Note: when using suds, you will almost always end up needing to use the doctor!

Finally, a little bonus for debugging SOAP; TCPdump is your friend. On Mac, you can run TCPdump like so:

sudo tcpdump -As 0  

This can be helpful for inspecting the requests that actually go over the wire.

The above two code snippets are also available as gists:

• SOAP Request with requests
• SOAP Request with suds