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Error 404--Not Found

Error 404--Not Found

From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:

10.4.5 404 Not Found

The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.

If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.

LDAP (Lightweight Directory Access Protocol)

A standard for querying and updating a directory and an answer to the failures of X.500's overweight Directory Access Protocol.

Unlike, X.500, which requires the OSI protocol stack, LDAP uses the far more popular TCP/IP stack (and omits some X.500 functions).


LDAP defines a communication protocol. That is, it defines the transport and format of messages used by a client to access data in an X.500-like directory. LDAP does not define the directory service itself. However, when referring to a directory that can be accessed using LDAP, the directory is usually called an LDAP directory.

Today, LDAP Version 3 (LDAPv3) is the foundation for a centralized enterprise directory available to any application.

Every directory vendor supports LDAP, and there are thousands of LDAP-compliant products that act as clients to those directories. The protocol has become the standard used throughout large companies to access directory information about users and resources.

What LDAPv3 lacks is widely adopted access control and back-end integration extensions, such as replication, which are needed to integrate disparate directories and build a distributed directory service. Today, metadirectories solve that issue within a company, but the problems have mostly trapped LDAP behind the firewall. Experts say it will take help from emerging technologies such as XML to solve it.

Directory standard at a crossroads, Network World, 04/22/02.

FAQs, downloads and other resources.

Directories research center
Latest directory news and analysis from Network World.



Diagram specification can be mentioned more for quick understanding.

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