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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?
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The HTTP Upgrade mechanism is used to establish HTTP/2 starting from plain HTTP. The client starts an HTTP/1.1 connection and sends an Upgrade: h2c header. If the server supports HTTP/2, it replies with HTTP 101 Switching Protocol status code. The HTTP Upgrade mechanism is used only for cleartext HTTP2 (h2c).
Upgrading to a WebSocket connection The WebSocket() constructor does all the work of creating an initial HTTP/1.1 connection then handling the handshaking and upgrade process for you. Note: You can also use the "wss://" URL scheme to open a secure WebSocket connection.
HTTPS ensures that your customers are communicating with the intended site and not a fake version. With HTTPS, any information transmitted between the site's server and the site visitor's browser can't be altered or corrupted during transfer.
WebSocket is an upgraded, quick, and seamless protocol to use when one needs to establish constant client-server communication. Even if the data is continuously transmitted, WebSocket ensure the connection is intact and data is highly secured in the process.
HTTP Upgrade is used to indicate a preference or requirement to switch to a different version of HTTP or to another protocol, if possible:
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#productFor example,
Upgrade: HTTP/2.0, SHTTP/1.3, IRC/6.9, RTA/x11The Upgrade header field is intended to provide a simple mechanism for transition from HTTP/1.1 to some other, incompatible protocol.
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).
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