From a post on Medium:
Airtel is sniffing and intercepting ALL unencrypted traffic going upstream from CloudFlare’s India data centres, irrespective of what ISP the user is on. This potentially affects everyone in India accessing ANY of the 2 million+ sites on CloudFlare.
Read more on Medium.
For its part, Airtel denies the claims. As reported on India TV News:
Airtel responded to the allegation by calling it “baseless & incorrect”.
“This is completely baseless & incorrect. As a policy, Airtel does not block/sniff any content. Only in the case of instructions/orders from the Government or the Courts, specified URLs are blocked. Blocking of any page [as per instructions from relevant authorities] is done at the URL level and not whether it is http/https. This also has nothing to do with the validity of any certificate,” Airtel said in a statement.