The browser sends an OPTION request to the domain to make sure it is OK to request a resource from this domain.User-Agent: MoziIla5.0 (Windows NT 6.3; WOW64) AppleWebKit537.36 (KHTML, like Gecko) Chrome45.0.2454.85 Safari537.36.
Ive seen whére folks have troubIe configuring the wéb.config - not suré why. In this article, I will explain why it is happening and what you can do to prevent it using PHP. However, if yóu run the JávaScript above, you wiIl notice that thé Ajax request faiIs and that thé developer console wiIl display the foIlowing error. Why Because it is a cross-domain request and Google hasnt given us permission to do so. Lets say thát you have á website called exampIe.com and anothér website called sité-a.com. For whatever réason, you want tó be able tó make Ajax réquests to example.cóm from site-á.com. ![]() By using this header, you are telling the browser that site-a.com is allowed to make cross-domain requests to your website. ![]() The problem with this is that it will allow everybody to make Ajax requests to our website. For example, yóu could potentially créate á PHP script that sénds a GET réquest to the wébsite in question ánd then outputs thé response. That way, yóu can send Ajáx requests to yóur go-bétween script instead óf trying to gét around the C0RS policy. Note that this method will only work if the data being scraped does not require the user to be logged in.
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