This is one of the Node http events. Did the obvious Google Searches, didn’t find much. What is it exactly?
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This is one of the Node http events. Did the obvious Google Searches, didn’t find much. What is it exactly?
HTTP Upgrade is used to indicate a preference or requirement to switch to a different version of HTTP or to another protocol, if possible:
According to the IANA register, there are only 3 registered mentions of it (including one in the HTTP specification itself).
The other two are for:
Upgrading to TLS Within HTTP/1.1 (almost never used, not to be confused with HTTP over TLS, which defines HTTPS as widely used). This upgrade allows for a similar mechanism to STARTTLS in other protocols (e.g. LDAP, SMTP, …) so as to be able to switch to TLS on the same port as the plain connection, after exchanging some of the application protocol messages, as opposed to having the entire HTTP exchange on top of SSL/TLS without it needing to know it’s on top of TLS (the way HTTPS works).
Upgrading to WebSockets (still a draft).