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Server Load, Server Status, Mysql Load, VPS Server, Dedicated, Web Hosting. Internet protocols define the format for all Internet. What this means is that for your computer to. Internet, both must be speaking the same. For file transfers, FTP (File Transfer Protocol) is used, and for Web. HTTP (Hyper. Text Transfer Protocol) is used. The next few sections introduce the Internet protocols and discuss. Web. A good understanding of what's. PHP programming. because within the requests and responses flying back and forth from client to. TCP/IPThe Internet is designed to provide communications between. Every computer or device that has an IP address. Internet. The main protocol (actually a suite of networking protocols) used. TCP/IP (Transmission Control Protocol over. Internet Protocol.). TCP/IP is simply a method of describing information packets (the packages of bits that are. T1- line from node to node, until they reach their intended. One advantage of the TCP/IP protocol is that it can reroute. When. the user tells the browser to fetch a Web page, the browser parcels up (turns. TCP. TCP is a transport protocol, which. It ensures that the. Before the packets of data are sent out across the network, they. IP address). So a second protocol called Hyper. Text. Transfer Protocol (or HTTP) puts an address label on them, so that TCP/IP knows. HTTP is the protocol used by the World Wide Web. You can think of TCP/IP as the postal service that does the. HTTP is the stamp and address on the letter. The message passed from the browser to the Web server is. HTTP request. When the Web server receives. Web page or file), it. If it finds the page, it parcels. HTML contained within (using TCP), addresses these packets to the browser. HTTP), and sends them back across the network. If the Web server cannot. Error 4. 04: Page Not Found), it parcels up, and dispatches that. The message sent from the Web server to the browser is. HTTP response. The HTTP Protocol. There's quite a bit more technical detail to all of this. HTTP works. When a request for a Web page. URL. There is a. lot of extra information that is sent as part of the request. This is also true. You'll. explore these different types of information shortly. A lot of the information that's passed within the HTTP message is. Although. you don't have to worry about creating this information yourself, you should be. HTTP request and HTTP response because the PHP script that you write can. Whether it's a client request or a server response, every HTTP. HTTP header, and the HTTP body. The content of these three sections is dependent on whether the message. The HTTP Request. The HTTP request that the browser sends to the Web server. Here's an example of the request. GET /testpage. htm HTTP/1. Accept- Language: en- us. Connection: Keep- Alive. Host: www. wrox. com. Referer: http: //webdev. Sample. List. php? User- Agent: Mozilla (X1. I; Linux 2. 0. 3. The Request Line. The first line of every HTTP request is the request line, which contains three pieces of information: An HTTP command known as a method (such as GET and POST)The path from the server to the resource that the client is. The version number of HTTP (such as HTTP 1. Here's an example: GET /testpage. HTTP/1. 1. The method is used to tell the server how to handle the request. The. majority of HTTP requests made on the Internet are GET requests (when you click. GET request is made). The information required by the request can be. HTML or PHP page, to the output of a Java. Script or Perl. Script. You can send some limited data to the. URLHEADThe same as the GET method, except. HTTP header only and no data. POSTIndicates that data will be sent to the server as part of. HTTP body (from form fields, for example). This data is then transferred to. Web server. HTTP supports a number of other methods, including PUT, DELETE, TRACE, CONNECT, and OPTIONS. As a rule, you'll find that these are less common. If you want to know more. RFC 2. 06. 8, which you can find at www. The HTTP Request Header. The next bit of information sent is the HTTP header. This. contains details of what document types the client will accept back from the. The HTTP request's header contains. General: Information about either the client or server, but. Entity: Information about the data being sent between the. Request: Information about the client configuration and. Here's an example of a request header: Accept: */*. Accept- Language: en- us. Connection: Keep- Alive. User- Agent: Mozilla (X1. I; Linux 2. 0. 3. As you can see, the HTTP header is composed of a number of lines. HTTP header information, and. There are many different lines that can comprise a HTTP. HTTP has to indicate when it has. To do this, a blank line is. The HTTP Request Body. If the POST method is used in the. HTTP request line, then the HTTP request body contains any data that is being. Otherwise, the HTTP request. The HTTP Response. The HTTP response is sent by the server back to the client. Here's an example. HTTP/1. 1 2. 00 OK //the status line. Date: Fri, 3. 1st Oct 2. GMT //the general header. Server: Apache/1. Unix) (SUSE/Linux) PHP/4. Last- modified: Fri, 2. Oct 2. 00. 3, 1. 4: 0. GMT //the entity header. The Response Line. The response line contains only two bits of information: The HTTP version number. An HTTP request code that reports the success or failure of. The example response line,returns HTTP status code 2. OK, denoting the success of the request, and that the. If the response. line contains HTTP status code 4. Web server failed to find the requested resource. Error code values are. In the HTTP response, the header information again falls into three. General: contains information about either the client or. Entity: contains information about the data being sent. Response: contains information about the server sending the. Once again, the header consists of a number of lines, and uses a. Here's an. example header, with the name of each line commented at the end: Date: Fri, 3. Oct 2. 00. 3, 1. 8: 1. GMT //the general header. Server: Apache/1. Unix) (SUSE/Linux) PHP/4. Last- modified: Fri, 2. Oct 2. 00. 3, 1. 4: 0. GMT //the entity header. The first line is self- explanatory. On the second line, Server, indicates the type of software the Web server is. Because this example is requesting a file somewhere on the Web server. The header can contain much more information than this, or. If you want to know more. RFC 2. 06. 8. (Sections 4. The Response Body. If the request was successful, the HTTP response body. HTML code (together with any script that is to be executed by the. If unsuccessful, a failure. Running PHP Scripts via an HTTP. Request. Actually, any client application (not just a browser) that. HTTP request to a Web Server can activate and run a PHP program. In. fact, it's not a requirement that the file display anything to the user (meaning. Web page). If a properly formatted HTTP. Web server, asking for a file containing PHP code, and. PHP program will. The Web Server. If you (or your system administrator) have properly set up. Web server software for the OS it's running on and for PHP, you can expect. HTTP requests for files containing PHP code will be properly handled and. PHP programs will run. The PHP Processing Engine. PHP is actually composed of function modules, a language. Zend engine, now out as version 2. Web server. interface. The interface allows PHP to communicate with the Web server. The function modules give PHP its many valuable. Zend engine (the language core) does the hard work of. Zend does just a little. It's important to note that PHP is. AA ee oo Mera Dil Na Todo - Raja Babu (1. Please try again later.
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