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Uniform Resource Identifiers in Java Implementation PDF 417 in Java Uniform Resource Identifiers




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3.2 Uniform Resource Identifiers generate, create none none in none projects Web application URIs have been know none for none n by many names: WWW addresses, Universal Document Identifiers, Universal Resource Identifiers [3], and finally the combination of Uniform Resource Locators (URL) [4] and Names (URN) [20]. As far as HTTP is concerned, Uniform Resource Identifiers are simply formatted strings which identify via name, location, or any other characteristic a resource. 3.

2.1 General Syntax URIs in HTTP can be represented in absolute form or relative to some known base URI [11], depending upon the context of their use. The two forms are differentiated by the fact that absolute URIs always begin with a scheme name followed by a colon.

For definitive information on URL syntax and semantics, see Uniform Resource Identifiers (URI): Generic Syntax and Semantics, RFC 2396 [42] (which replaces RFCs 1738 [4] and RFC 1808 [11]). This specification adopts the definitions of URI-reference, absoluteURI, relativeURI, port, host, abs_path, rel_path, and authority from that specification. The HTTP protocol does not place any a priori limit on the length of a URI.

Servers MUST be able to handle the URI of any resource they serve, and SHOULD be able to handle URIs of unbounded length if they provide GET-based forms that could generate such URIs. A server SHOULD return 414 (Request-URI Too Long) status if a URI is longer than the server can handle (see section 10.4.

15).. Appendix C Hypert ext Transfer Protocol: HTTP/1.1. Note: Servers ought none for none to be cautious about depending on URI lengths above 255 bytes, because some older client or proxy implementations might not properly support these lengths. 3.2.

2 http URL The http scheme is used to locate network resources via the HTTP protocol. This section defines the scheme-specific syntax and semantics for http URLs..

http_URL = "http:" "//" host [ ":" port ] [ abs_path [ " " query ]]. If the port is empt none for none y or not given, port 80 is assumed. The semantics are that the identified resource is located at the server listening for TCP connections on that port of that host, and the Request-URI for the resource is abs_path (section 5.1.

2). The use of IP addresses in URLs SHOULD be avoided whenever possible (see RFC 1900 [24]). If the abs_path is not present in the URL, it MUST be given as / when used as a Request-URI for a resource (section 5.

1.2). If a proxy receives a host name which is not a fully qualified domain name, it MAY add its domain to the host name it received.

If a proxy receives a fully qualified domain name, the proxy MUST NOT change the host name. 3.2.

3 URI Comparison When comparing two URIs to decide if they match or not, a client SHOULD use a case-sensitive octet-by-octet comparison of the entire URIs, with these exceptions: A port that is empty or not given is equivalent to the default port for that URIreference; Comparisons of host names MUST be case-insensitive; Comparisons of scheme names MUST be case-insensitive; An empty abs_path is equivalent to an abs_path of / . Characters other than those in the reserved and unsafe sets (see RFC 2396 [42]) are equivalent to their % HEX HEX encoding. For example, the following three URIs are equivalent:.

http://abc.com:80/~ smith/home.html http://ABC.

com/%7Esmith/home.html http://ABC.com:/%7esmith/home.

html. Hypertext Transfer none none Protocol: HTTP/1.1. 3.3 Date/Time Formats 3.3.1 Full Date HTT none for none P applications have historically allowed three different formats for the representation of date/time stamps:.

Sun, 06 Nov 1994 08 :49:37 GMT ; RFC 822, updated by RFC 1123 Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036 Sun Nov 6 08:49:37 1994 ; ANSI C"s asctime() format. The first format is none none preferred as an Internet standard and represents a fixed-length subset of that defined by RFC 1123 [8] (an update to RFC 822 [9]). The second format is in common use, but is based on the obsolete RFC 850 [12] date format and lacks a four-digit year. HTTP/1.

1 clients and servers that parse the date value MUST accept all three formats (for compatibility with HTTP/1.0), though they MUST only generate the RFC 1123 format for representing HTTP-date values in header fields. See section 19.

3 for further information. Note: Recipients of date values are encouraged to be robust in accepting date values that may have been sent by non-HTTP applications, as is sometimes the case when retrieving or posting messages via proxies/gateways to SMTP or NNTP. All HTTP date/time stamps MUST be represented in Greenwich Mean Time (GMT), without exception.

For the purposes of HTTP, GMT is exactly equal to UTC (Coordinated Universal Time). This is indicated in the first two formats by the inclusion of GMT as the three-letter abbreviation for time zone, and MUST be assumed when reading the asctime format. HTTP-date is case-sensitive and MUST NOT include additional LWS beyond that specifically included as SP in the grammar.

. HTTP-date = rfc1123-date rfc850-date asctime-date rfc11 23-date = wkday "," SP date1 SP time SP "GMT" rfc850-date = weekday "," SP date2 SP time SP "GMT" asctime-date = wkday SP date3 SP time SP 4DIGIT date1 = 2DIGIT SP month SP 4DIGIT ; day month year (e.g., 02 Jun 1982) date2 = 2DIGIT "-" month "-" 2DIGIT ; day-month-year (e.

g., 02-Jun-82) date3 = month SP ( 2DIGIT . ( SP 1DIGIT )) ; m none none onth day (e.g., Jun 2) time = 2DIGIT ":" 2DIGIT ":" 2DIGIT ; 00:00:00 - 23:59:59 wkday = "Mon" .

"Tue" . "Wed" . "Thu" . "Fri" . "Sat" . "Sun" weekday = "Monday" . "Tuesday" . "Wednesday" . "Thursday" . "Friday" . "Saturday" . "Sunday". Appendix C Hypert ext Transfer Protocol: HTTP/1.1.
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