3) Handling Browser Exceptions

                               

                                    Handling Browser Exceptions

While browsing through the internet, some errors might occur. Due to these errors, web pages might not be displayed either partially or completely. The browser displays messages to inform the user that a particular error has occurred. But please note that same errors may be worded differently in different browsers. Some of such errors are explained below:

1. Page can’t be displayed / This site Can’t be reached

This message appears in the browser window when internet speed is too slow to open a page or the main input line of network to the internet device is disconnected. To show this message to the students, the teachers may switch off the main network switch of the computer lab and then open a web page.

 

Fig : Error Message – ‘This site can’t be reached’

2. Server Not found / No Internet Connection

This error appears when either the connection with Internet Service provider(ISP) is not operational or the ISP server is down.

To show this error to the students, go to network settings and disable the adapter by right clicking on it. Now open the browser window and type the URL of any website in the address bar. The error will be displayed on the browser.

Fig: Error in Mozilla Firefox– ‘Server not found’

Do not forget to enable the internet connection again. Go to Network settings and right click again to enable the adapter. The internet connection will start working again.

Note: For the same error Google Chrome shows the message – “ No Internet Connection’

Fig: Error in Google Chrome

4. The requested URL / page was not found (Error 404)

This error is displayed when the requested web page does not exist on the server. This could be due to spelling mistakes in the URL.

To understand this, open any browser and visit https://www.google.co.in.

Add /india at the end of that URL and change it to https://www.google.co.in/india. Thereafter press Enter/Search button. You will the error in the browser window.

Fig: Error – Requested URL not found

5. Page may have been removed

This error is displayed when the page requested was previously stored on the web server but presently it has been removed or deleted from the web server.

6. Heavily loaded page getting slow to download

This error may occur due to two reasons:

1. It may occur when the size of the requested web page is large due to presence of lot of graphic content (especially high definition images and videos) on the web page. Such web pages take lot of time to download. Hence the error is displayed in the web browser.

    ii. When the download speed of internet connection is very less, then also the requested web page takes more time to be displayed in the browser window. This results in the error message – Heavily loaded page getting slow to download.