barcode generator visual basic 6 source code The HTTP Response from the Server in Java

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The HTTP Response from the Server
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However the server processes the request, the result is the same an HTTP response Similar to a request, a response consists of up to four parts: a status line, zero or more response headers, an empty line signaling the end of the headers, and the data that makes up the request The status line consists of up to three tokens: I The HTTP version Just as the client indicates the highest version it can understand, so the server indicates its capabilities I The response code This is a three-digit numeric code that indicates whether the request succeeded or failed and, if it failed, the reason why A list of HTTP status codes is found in Appendix C
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Overview of the Hypertext Transfer Protocol (HTTP)
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THE WEB PROGRAMMING ENVIRONMENT
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I An optional response description, which is a human-readable explanation of the response code A typical HTTP response status line looks like this
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HTTP/10 200 OK
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which indicates a successful retrieval of the requested document according to the 10 level of the HTTP specification After the status line comes the response headers, with an empty line as the delimiter Like request headers, these indicate the capabilities of the server and identify details about the response data Appendix C lists valid HTTP response headers The last part of the response is the requested data itself, typically an HTML document or image stream After the data is sent, the server closes its end of the connection
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A look at several examples can make this clearer A simple case of a GET request would be what happens when a URL is typed in a browser address line or a hyperlink is clicked If you open the URL http://wwwlyricnotecom/simplehtml, the Web browser opens a socket connection to the wwwlyricnotecom host on port 80, and then writes the following line
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GET /simplehtml HTTP/10
followed by an empty line The Web server returns the following:
HTTP/11 200 OK Date: Wed, 31 Jan 2001 03:55:43 GMT Server: Apache/1312 (Win32) Content-Length: 241 Content-Type: text/html <HTML> <BODY> <H3>Welcome</H3> to <b>The Lyric Note</b>, the best Internet source for <UL> <LI>sheet music <LI>musical instruments <LI>books on musical topics
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<LI>music software, and <LI>musical gift items </UL> </BODY> </HTML>
The browser first parses the status line and sees the status code indicates the request was successful The browser then parses each of the request headers, which inform it 241 bytes of HTML follow The browser reads the HTML, formats it according to the syntax and semantics of HTML, and displays it in the browser window, as shown in Figure 3-2 An HTML document may contain references to other resources that need to be loaded when the document is loaded For example, images are often embedded in the page with the HTML <img> tag JavaScript files or external style sheets may also be required The Web browser (not the server) recognizes these cases and makes additional requests for the other resources This bears repeating The Web server doesn t read through the HTML it serves, recognize an <img> tag, and then start sending the bytes of the image file The Web server simply sends back the resource that was requested in one operation If, a few milliseconds later, the browser requests an image file, the server returns this in a separate operation The Web browser does all this under the covers, so the user is unaware several requests are involved
Figure 3-2
Results of a simple HTTP request
3:
Overview of the Hypertext Transfer Protocol (HTTP)
THE WEB PROGRAMMING ENVIRONMENT
To augment the previous example slightly, suppose you open http://www lyricnotecom/compoundhtml The browser again opens a socket connection to wwwlyricnotecom port 80 and requests the HTML document,
GET /compoundhtml HTTP/10
which results in the following response:
HTTP/11 200 OK Date: Tue, 30 Jan 2001 23:42:16 GMT Server: Apache/1312 (Win32) Content-Length: 380 Content-Type: text/html <HTML> <HEAD> <LINK REL="stylesheet" HREF="lyricnotecss"> </HEAD> <BODY> <IMG SRC="images/logopng"> <HR COLOR="#005A9C" ALIGN="LEFT" WIDTH="500"> <H3>Welcome</H3> to <b>The Lyric Note</b>, the best Internet source for <UL> <LI>sheet music <LI>musical instruments <LI>books on musical topics <LI>music software, and <LI>musical gift items </UL> </BODY> </HTML>
As the browser is parsing the HTML, it notices the style sheet request:
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