Cambium Networks cnMatrix EX2028 handleiding

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Security Features 275

HTTP

Managing HTTP

Feature Description

The Hypertext Transfer Protocol(HTTP) is an application protocol used in the implementation of the

cnMatrix Web user interface.

The cnMatrix switch includes an implementation of the HTTP server that implements the HTTP protocol

version 1.1. This implementation is a subset of the HTTP 1.1 specification optimized for embedded systems,

and is not a complete implementation of the full HTTP 1.1 specification.

The HTTP server in the software maintains persistent connections with clients over both Ipv4 and Ipv6

addresses, over TCP and over SSL. After the server processes a request from the client, the server

immediately closes the socket connection unless the client had sent a KEEP_ALIVE header or indicated

the content-type as MULTIPART in its request, if the version of the client is less than 1.1. If the version of

the client is 1.1 or greater the server does not close the socket connection immediately. This allows the

same socket connection to be reused for serving all the requests from the client. Thus, resulting in better

Web UI management performance. The connection is closed if the server receives a close connection

token in the request, or if there is no activity on the connection for more than 5 minutes, or if any network

or client failure is suspected. In the last case, the server also sends a message with the connection header

containing a close connection token.

The HTTP server allows further requests to come from the same client, while processing one request from

the client.

The server buffers the requests and dispatches the requests to other internal managed modules in the

same order in which the requests arrived.

The server collects the status of the requests and sends responses to the client in the same order in which

the requests arrived.

A browser that supports pipelining can take advantage of this capability to reduce the latency associated

with multiple requests. The server implements the expiration model and the validation model to allow

clients to cache Web pages.

All the Web UI management pages implemented for managing features in the cnMatrix, are statically

compiled into the cnMatrix image. This allows the client to specify an absolute URL (for example, GET

http://www.host.com/path.file.html). The server accepts this and looks for such a file on the file system in

the switch. If present, the file is then returned.

The server parses the requests from the clients to find out the character set used in the requests. If the

server does not support the requested character set, the server returns an error message to the client.

The server also parses the Transfer Encoding header field in the requests from the clients. If the Transfer

Encoding is chunked, the server extracts data from the request message depending upon the size of the

chunk. A 501 (Unimplemented) error code is returned and the connectionis closed, if it receives an entity

body with the Transfer Encoding that it does not understand. The response headers are composed of the

following:

HTTP version – 1.1;

Date header including current time in the form of Greenwich Mean Time;

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