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WWW AND HTTP
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Entity header The entity header gives infonnation about the body of the document Although it is mostly present in response messages, some request messages, such as POST or PUT methods, that contain a body also use this type of header See Table 276 for a list of some entity headers and their descriptions
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Table 276 Entity headers
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Header Description
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Allow Content-encoding Content-language Content-length Content-range Content-type Etag Expires Last-modified Location
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Lists valid methods that can be used with a URL Specifies the encoding scheme Specifies the language Shows the length of the document Specifies the range of the document Specifies the medium type Gives an entity tag Gives the date and time when contents may change Gives the date and time of the last change Specifies the location of the created or moved document
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The body can be present in a request or response message Usually, it contains the document to be sent or received
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Example 271
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This example retrieves a document We use the GET method to retrieve an image with the path /usr/bin/imagel The request line shows the method (GET), the URL, and the HTTP version (11) The header has two lines that show that the client can accept images in the GIF or JPEG format The request does not have a body The response message contains the status line and four lines of header The header lines define the date, server, MIME version, and length of the document The body of the document follows the header (see Figure 2716)
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Figure 2716 Example 271
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Request (GET method) GET lusrlbinlimage1 HTTP/ll Accept: image/gif Accept: image/jpeg
Server
cu:::u::J
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HTIP/ll 200 OK Date: Mon, 07-Jan-05 13:15:14 GMT Server: Challenger MIME-version: l0 Content-length: 2048
(Body of the document)
Response
SECTION 273
HTTP
Example 272
In this example, the client wants to send data to the server We use the POST method The request line shows the method (POST), URL, and HTTP version (11) There are four lines of headers The request body contains the input information The response message contains the status line and four lines of headers The created document, which is a CGI document, is included as the body (see Figure 2717)
Figure 2717 Example 272
Request (POST method) POST /cgi-binldocpl HTIP/1l Accept: */* Accept: image/gif Accept: image/jpeg Content-length: 50 (Input information)
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HTTP/l1 200 OK Date: Mon, 07-Jan-02 13:15:14 GMT Server: Challenger MIME-version: 10 Content-length: 2000
(Body of the document)
Response
Example 273
HTTP uses ASCII characters A client can directly connect to a server using TELNET, which logs into port 80 The next three lines show that the connection is successful We then type three lines The first shows the request line (GET method), the second is the header (defining the host), the third is a blank, terminating the request The server response is seven lines starting with the status line The blank line at the end terminates the server response The file of 14,230 lines is received after the blank line (not shown here) The last line is the output by the client
$ teinet wwwmhhecom 80
Trying 1984524104 Connected to wwwmhhecom (1984524104) Escape character is 11\]'
GET /engcslcompscilforouzan HTTP/It From: forouzanbehrouz@fbdaedu
HTTP/tl 200 OK Date: Thu, 28 Oct 2004 16:27:46 GMT Server: Apache/l39 (Unix) ApacheJServ/112 PHP/412 PHP/3018 MIME-version:10 Content-Type: text/html
WWW AND HTTP
Last-modified: Friday, 15-0ct-04 02:11:31 GMT Content-length: 14230
Connection closed by foreign host
Persistent Versus Nonpersistent Connection
HTTP prior to version 11 specified a nonpersistent connection, while a persistent connection is the default in version 11
Nonpersistent Connection
In a nonpersistent connection, one TCP connection is made for each request/response The following lists the steps in this strategy:
1 The client opens a TCP connection and sends a request 2 The server sends the response and closes the connection 3 The client reads the data until it encounters an end-of-file marker; it then closes the connection
In this strategy, for N different pictures in different files, the connection must be opened and closed N times The nonpersistent strategy imposes high overhead on the server because the server needs N different buffers and requires a slow start procedure each time a connection is opened
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