
Error Tones
Issue 1 April 2005 95
Error Tones
Error tones are consistent with other applications. When a labeled button is pressed but the
button’s function is not specified for the current state of the browser, an error tone sounds.
Presses of unlabeled Feature buttons or softkeys are ignored. When users press a Feature
button or softkey inappropriately, they receive an error tone.
HTTP Protocol
The Web browser uses an HTTP client to communicate with Web servers.
HTTP Header
User Agent
The User-Agent request-header field contains the Web browser’s signature. This is for:
● tracking requests,
● statistical purposes,
● tracing protocol violations, and
● automated user agent recognition to tailor responses to avoid particular user agent
limitations.
User agents should include the User-Agent request-header field with requests. The field can
contain multiple product tokens and comments identifying the agent (browser) and any
sub-products that form a significant part of the user agent. By convention, the product tokens
are listed in order of their significance in identifying the application.
User-Agent = “User-Agent” “:” 1*(product | comment)
Example: User-Agent: CERN-LineMode/2.15 libwww/2.17b3
The User-Agent header is included in all HTTP messages initiated by the browser, formatted as
specified below for the appropriate IP telephone.
Kommentare zu diesen Handbüchern