Specifies one or more protocol-level WebSocket extensions to ask the server to use.
#Super tcp download full version upgrade#
Other than the Upgrade and Connection headers, the rest are generally optional or handled for you by the browser and server when they're talking to each other. The following headers are involved in the WebSocket upgrade process. Effectively, the connection becomes a two-way pipe as soon as the upgraded response is complete, and the request that initiated the upgrade can be completed over the new protocol. Right after sending the 101 status code, the server can begin speaking the new protocol, performing any additional protocol-specific handshakes as necessary. If it does not (or cannot) upgrade the connection, it ignores the Upgrade header and sends back a regular response (for example, a 200 OK). If the server decides to upgrade the connection, it sends back a 101 Switching Protocols response status with an Upgrade header that specifies the protocol(s) being switched to. See Upgrading to a WebSocket connection for more details. Other headers may be required depending on the requested protocol for example, WebSocket upgrades allow additional headers to configure details about the WebSocket connection as well as to offer a degree of security in opening the connection. This means that a typical request that includes Upgrade would look something like: GET /index.html HTTP/1.1 The Upgrade header field is used by clients to invite the server to switch to one of the listed protocols, in descending preference order.īecause Upgrade is a hop-by-hop header, it also needs to be listed in the Connection header field.
Experimental Feature-Policy: geolocation.Experimental Feature-Policy: fullscreen.Experimental Feature-Policy: encrypted-media.Experimental Feature-Policy: document-domain.Experimental Feature-Policy: display-capture.Experimental Feature-Policy: ambient-light-sensor.Experimental Feature-Policy: accelerometer.Reason: CORS preflight channel did not succeed.Reason: CORS header 'Origin' cannot be added.Reason: Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is '*'.Reason: Multiple CORS header 'Access-Control-Allow-Origin' not allowed.Reason: CORS header 'Access-Control-Allow-Origin' missing.Reason: missing token 'xyz' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channel.Reason: expected 'true' in CORS header 'Access-Control-Allow-Credentials'.Reason: Did not find method in CORS header 'Access-Control-Allow-Methods'.Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'.Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'.Reason: CORS request external redirect not allowed.Reason: CORS header 'Access-Control-Allow-Origin' does not match 'xyz'.