Appium Architecture

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Appium is an HTTP server which is written in Node.js and exposes REST API. It creates and handles multiple WebDriver sessions. It receives connections from a client, listens for commands, executes those commands on a mobile device, and responds with an HTTP response. It is same as the Selenium server, where in selenium server gets HTTP requests from Selenium client libraries.

Like selenium tests, appium tests are also written once and can be run on multiple devices (well almost). This primarily entails four entities -

Tests, written in one of the appium supported languages
Appium server (also known as test server), which interacts with device (or emulator) running the test
Device (or emulator) to run tests on
Machine from where tests are run

This could be visualized from following Appium Architecture Image

Herein one machine can be used to run both appium server and test. In Appium video tutorial we would be running appium server on the same machine on which tests are executed. Test code performs HTTP calls to server which then translates those commands into device specific actions sent to device. These commands are user interactions to the device for ex - clicking on button, swiping the screen, scrolling in to area etc

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Selenium Tutorial: Ant Build for Selenium Java project

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Capture network traffic using WebDriver

We often come across testing requirements when we need to analyze the network traffic to find - HTTP status of page Analyze header information to find if right information is passed Validating parameters related to ajax requests etc Selenium 1 has had a way to capture n/w traffic but the feature does not always work as expected. At times Selenium 1 does not capture all n/w traffic, And given that Selenium 1 APIs are almost dead it is

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