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The approach you choose typically depends on the server you're trying to make calls to: more specifically, the protocol(s) it supports.
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The SUDS library, a library that used to come included with the Python Standard Library, offered SOAP based functionality. However, SUDS development has been halted, and is no longer included in the standard library. In the interest of posterity, the legacy SUDS documentation has been condensed and can be found on the SUDS - Library Overview page. Note that the legacy documentation should be considered deprecated. |
Yes it can! However, it is important to understand that REST is an architecture, NOT a protocol. Instead, REST utilizes and describes how a protocol should be used. Thus, a RESTful architecture could use both of the protocols mentioned on this page, although HTTP is far more common.
While all Web Services follow the same standards, they all do different things. They wouldn't be worth anything if you didn't get the information you need, or if they contained a lot of excess data. If you are unfamiliar with a particular Web Service, there are a few things that you can do to figure out what data is available and how to get it.
Note: Web Services sometimes take a lot of time to return results, especially the first time they are called. If you put your Web Services script in a button, the client will freeze until the call is complete (this is because the event handlers are run on the GUI thread). It's a good idea to use system.util.invokeAsynchronous() or add a waiting image to your screen to let the user know Ignition is working as expected.