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The specification is split into two sections. Those features of HTTP for which implementations are usually consistent are described in the main body of this document.
Those features which have few or inconsistent implementations are listed in Appendix D. Practical information systems require more functionality than simple retrieval, including search, front-end update, and annotation.
HTTP allows an open-ended set of methods to be used to indicate the purpose of a request. An entity consists of metainformation in the form of entity headers and content in the form of an entity body.
These are often browsers, editors, spiders web-traversing robotsor other end user tools. Requests are serviced internally or by passing them, with possible translation, on to other servers.
A proxy must interpret and, if necessary, rewrite a request message before forwarding it. Proxies are often used as client-side portals through network firewalls and as helper applications for handling requests via protocols not implemented by the user agent. Unlike a proxy, a gateway receives requests as if it were the origin server for the requested resource; the requesting client may not be aware that it is communicating with a gateway.
Gateways are often used as server-side portals through network firewalls and as protocol translators for access to resources stored on non-HTTP systems. The tunnel ceases to exist when both ends of the relayed connections are closed.
Tunnels are used when a portal is necessary and the intermediary cannot, or should not, interpret the relayed communication. A cache stores cachable responses in order to reduce the response time and network bandwidth consumption on future, equivalent requests.
Any client or server may include a cache, though a cache cannot be used by a server while it is acting as a tunnel. Any given program may be capable of being both a client and a server; our use of these terms refers only to the role being performed by the program for a particular connection, rather than to the program's capabilities in general.
Likewise, any server may act as an origin server, proxy, gateway, or tunnel, switching behavior based on the nature of each request. A client establishes a connection with a server and sends a request to the server in the form of a request method, URI, and protocol version, followed by a MIME-like message containing request modifiers, client information, and possible body content.
The server responds with a status line, including the message's protocol version and a success or error code, followed by a MIME-like message containing server information, entity metainformation, and possible body content. Most HTTP communication is initiated by a user agent and consists of a request to be applied to a resource on some origin server.
In the simplest case, this may be accomplished via a single connection v between the user agent UA and the origin server O. There are three common forms of intermediary: A proxy is a forwarding agent, receiving requests for a URI in its absolute form, rewriting all or parts of the message, and forwarding the reformatted request toward the server identified by the URI.
A gateway is a receiving agent, acting as a layer above some other server s and, if necessary, translating the requests to the underlying server's protocol. A tunnel acts as a relay point between two connections without changing the messages; tunnels are used when the communication needs to pass through an intermediary such as a firewall even when the intermediary cannot understand the contents of the messages.
A request or response message that travels the whole chain must pass through four separate connections. This distinction is important because some HTTP communication options may apply only to the connection with the nearest, non-tunnel neighbor, only to the end-points of the chain, or to all connections along the chain.
Although the diagram is linear, each participant may be engaged in multiple, simultaneous communications. Any party to the communication which is not acting as a tunnel may employ an internal cache for handling requests. The following illustrates the resulting chain if B has a cached copy of an earlier response from O via C for a request which has not been cached by UA or A.
The default port is TCP 80 but other ports can be used. This does not preclude HTTP from being implemented on top of any other protocol on the Internet, or on other networks. Except for experimental applications, current practice requires that the connection be established by the client prior to each request and closed by the server after sending the response.
Both clients and servers should be aware that either party may close the connection prematurely, due to user action, automated time-out, or program failure, and should handle such closing in a predictable fashion. In any case, the closing of the connection by either or both parties always terminates the current request, regardless of its status.
Appendix C describes the ways in which the context of HTTP allows for different use of Internet Media Types than is typically found in Internet mail, and gives the rationale for those differences. Implementors will need to be familiar with the notation in order to understand this specification.
The augmented BNF includes the following constructs: Whitespace is only significant in that indentation of continuation lines is used to indicate a rule definition that spans more than one line.
Angle brackets are used within definitions whenever their presence will facilitate discerning the use of rule names. Unless stated otherwise, the text is case-insensitive. Thus, " elem foo bar elem " allows the token sequences "elem foo elem" and "elem bar elem".HTTP rewrites change the request as it moves between the client and the backends transparently (as opposed to redirects, which tell the client to send the request to another URL.) It is often used to maintain compatibility between old and new URLs or to turn user-friendly URLs into CMS-friendly URLs.
Forward Proxies and Reverse Proxies/Gateways. Apache HTTP Server can be configured in both a forward and reverse proxy (also known as gateway) mode.. An ordinary forward proxy is an intermediate server that sits between the client and the origin ashio-midori.com order to get content from the origin server, the client sends a request to the proxy naming the origin server as the target.
I wand to send post request to Apache HTTP server and then that request is to be forwarded to back end server(It locates at somewhere else). So I implemented Node js client and Apache module. Request and response between those two are ok. POST data is discarded on redirect as a client will perform a GET request to the URL specified by the Period.
The only option is to convert the POST parameters to GET parameters and tack them onto the end of the URL you're redirecting to. This cannot be done in ashio-midori.comss file rewrite.
I have to modify the response headers delivered via a proxy rewrite directive I set up in an apache http server. Combining a proxy rewrite in apache http server with header manipulation. Getting only response header from HTTP POST using curl.
0. This document supplements the mod_rewrite reference ashio-midori.com describes how you can use mod_rewrite to redirect and remap request.
This includes many examples of common uses of mod_rewrite, including detailed descriptions of how each works.