Google's search functionality utilizes XHR requests for suggesting search results

One day, I decided to conduct an experiment using Google and Firebug. With my firebug open, I typed "in" into the search bar on Google. To see what was happening behind the scenes, I checked the "NET" tab in Firebug and noticed that several new GET requests had been sent out to retrieve a list of search autocomplete suggestions.

For example:

GET http://clients1.google.com/complete/search?hl=en&client=hp&expIds=17259,17315,23628,24549,26637,26761,26849,26869,27386,27404&q=i&cp=1

Surprisingly, these requests were categorized under the "JS" section in Firebug, rather than appearing as XHR (XMLHttpRequest). This made me wonder - isn't Google actually sending AJAX GET requests in the background?

Answer №1

It is highly likely that this is a JSONP request, which is commonly used to bypass cross-domain limitations on XHRs. In essence, they are dynamically injecting <script /> elements into their webpage, explaining why it appears under the JS section in Firebug.

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