web services - Jquery $.getJSON adds script tag to head -

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i debugging , noticed whenever call webservice $.getjson plugin webservice url gets added script tag in head of html split seconds , dissappears again. script tag has async property.

is normal behaviour ?

$.getjson(options.url, function(data) {                 self.address = data;                 self.addresswscallback();             });

according jquery cookbook cody lindley

if request cross-domain, jquery automatically treat request jsonp , fill in appropriate callback function name. means jquery initiate request inserting tag document instead of using xmlhttprequest object.

cross-domain requests in javascript jsonp relies on fact tags can have sources coming different origins. when browser parses tag, script content (residing on origin) , execute in current page’s context. normally, service return html or data represented in data format xml or json. when request made jsonp-enabled server however, returns script block executes callback function calling page has specified, supplying actual data argument.


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