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Lee4591628

 query : What is the purpose of GETting this external file? A website I am visiting occasionally makes XHR requests to http://detectportal.firefox.com/success.txt which is a text/plain resource whose body

@Lee4591628

Posted in: #Firefox #Http

A website I am visiting occasionally makes XHR requests to detectportal.firefox.com/success.txt which is a text/plain resource whose body contains the text success.

I am unable to figure out what the purpose of this HTTP request might be.

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@Kimberly868

Captive portals are generally found at public wi-fi hot-sports,
Starbucks, Airports.

Firefox uses this to detect if it's trapped in a
captive portal (success.txt not found) or can really access the internet
(success.txt found). In other words it's just Firefox checking for
a proxied environment.

If you put that URL into your hosts file. Firefox may decide that you
are caught in a fake wi-fi hotspot.


Source: groups.google.com/d/msg/mozilla.support.firefox/TJgV_uODg_I/uEe30_njBAAJ

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@Smith883

It is used by Firefox when detecting whether it is using a captive portal.

A captive portal is a Web page that the user of a public-access network is obliged to view and interact with before access is granted.

Captive portals are typically used by business centers, airports, hotel lobbies, coffee shops, and other venues that offer free Wi-Fi hot spots for Internet users.
searchmobilecomputing.techtarget.com/definition/captive-portal

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