March 2003
Intermediate to advanced
312 pages
7h 12m
English
Content preview from HTTP Developer’s Handbook
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Upgrade
The Upgrade header provides a method for the Web server and Web client to negotiate a change in protocol. The typical negotiation takes place with the client requesting the upgrade in protocol in the HTTP request, such as the following example request:
GET / HTTP/1.1 Host: 127.0.0.1 Upgrade: TLS/1.0 Connection: Upgrade
The Web server, as discussed in the section on status codes, will use a 101 Switching Protocols status code in the HTTP response to indicate a willingness to upgrade. Along with this, it also includes an Upgrade header and the same value for the Connection general header as used in the HTTP request:
HTTP/1.1 101 Switching Protocols Upgrade: TLS/1.0, HTTP/1.1 Connection: Upgrade
After the Web client receives a successful ...
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