2.2.4 Driver Selection Request
The Driver Selection Request is a standard HTTP GET request ([RFC2616] section 9.3) that sends the printer driver selection criteria to the server in a PrinterDriverQuery. The format of the HTTP request URL is specified by the following ABNF grammar rule [RFC5234].
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PrinterDriverQuery = [PRINT_SERVER] PRINTER_RESOURCE "?" DRIVER_QUERY PRINT_SERVER = "http:" "//" host [":" port] PRINTER_RESOURCE = abs_path DRIVER_QUERY = "createexe" "&" CLIENT_INFO CLIENT_INFO = 1*DIGIT
Here, "1*DIGIT" indicates "one or more occurrences of DIGIT". For the definitions of host, port, abs_path, and DIGIT, see [RFC2616] sections 2.2 and 3.2, and [RFC2396] sections 3.2.2 and 3.3.
How the client determines the host, port, and abs_path is not specified by this protocol. Typically, the port is either the HTTP default port "80" or another port that is configured by an administrator.
DRIVER_QUERY: The HTTP query component ([RFC2396] section 3.4), which constrains the selection of printer driver instances for the printer resource.
PRINT_SERVER: The address of the Web Point-and-Print Protocol server, whether or not the request is to be routed through a proxy.
PRINTER_RESOURCE: The name of the printer resource.
CLIENT_INFO: The environmental information on the client that is making the request, computed as a ClientInfo value (section 2.2.2) and formatted as the ASCII representation of a decimal integer.