Dr. Mark Humphrys

School of Computing. Dublin City University.

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Web services

Programmable interface to services at remote site. (i.e. Can be called by programs with no human user.)
Called "Web services" or the use of "Web APIs".

Example: Your app posts updates to Twitter without leaving the app. Needs read-write access over network. Through API interface - calling methods on remote site. Needs authentication.

Example: Manufacturer automatically queries distributors for stock levels and other shared information. Done over network, but general public has no access to this information.

The name "Web" implies uses HTTP. But some services in fact do not.





Service description




Popular APIs



2010 survey of web APIs.
From programmableweb.com.



2011 graph showing number of different web APIs.
From programmableweb.com.




REST v SOAP




2012 survey shows SOAP has bigger market share in finance category than in some other categories.
From programmableweb.com.





Future of APIs



Feeds      w2mind.org

On Internet since 1987.