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Is HTTP status code 426 Upgrade Required only meant signal an upgrade to a secure channel is required?
The Upgrade general-header allows the client to specify what
additional communication protocols it supports and would like to use
if the server finds it appropriate to switch protocols. The server
MUST use the Upgrade header field within a 101 (Switching Protocols)
response to indicate which protocol(s) are being switched.
Upgrade = "Upgrade" ":" 1#product
Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11
The Upgrade header field is intended to provide a simple mechanism
for transition from HTTP/1.1 to some other, incompatible protocol.
MySQL 5.5 to 5.6.35 upgrade - is the time/datetime/timestamp upgrade required?
By : dlc
Date : March 29 2020, 07:55 AM
Hope this helps We determined it is indeed possible to run a 5.6 replication slave in conjunction with a 5.5 master. The alter table ... force is not necessary either.