Selenium - What will happen behind the scenes when running client code

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We know there is a Selenium Server (Selenium RC Server), Selenium Client driver (driver specific to languages such as C#, Java etc) and we use them in our IDE for writing code.

Once we start running a code from IDE the following stuffs will happen behind the scenes.

1. The Client driver will first establishes a connection with Selenium server.

2. Selenium Server will do following:

a. It will create a session for that particular request

b. It will launch the desired browser (Specified in the code IE,FF,Chrome etc)

c. Loads the Selenium cores Javascript file into the specified browser (So as selenium server will have handle with the webpage for performing Selenese action)

3. Now the Client driver will send the program that we have written in IDE as selenese (by making conversion) and send it to Selenium server.

4. Selenium server is intelligent enough to understand the selenese command and triggers the corresponding javascript execution in the web browser.

5. Here Selenium Server act as a “Proxy Server” between the AUT (Application Under Test) and actual browser, due to the restriction of “Same origin policy” selenium server performs “Proxy Injection”. Being a proxy gives Selenium Server the capability of “lying” about the AUT’s real URL.

6. Now Selenium server requests the actual webserver for the page open request and then it receives the page and sends it to the browser.

7. Now any operation or request which the browser makes will eventually passes through Selenium RC server to actual webserver and vice verse.

Well we can see the same behind the scenes operation by our own. Let us see how we can do that.

Step 1

Open the selenium server 3.141.59 from command prompt using the following command.

java -jar selenium-server-standalone-3.141.59.jar

Step 2

Now navigate to the URL http://127.0.0.1:4444/wd/hub, which is nothing but the default URL in which selenium server start. Now our browser will have a page.

Step 3

Lets create a session by clicking on the Create Session button in the browser we have, now this will ask us to select the browser. Select a browser and click “OK” button, which will eventually create a session for us and launches a browser with empty page (Since we have not supplied any command to Selenium server at this point to open any URL or to perform any operations).

Here we have three more buttons with rest of steps we are going to perform.

That's it!

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Selenium - What will happen behind the scenes when running client code

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