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Chapter 24

Chapter 24. Hypertext Transfer Protocol (HTTP). CONTENTS. HTTP TRANSACTION REQUEST MESSAGE RESPONSE MESSAGE HEADER EXAMPLES SOME OTHER FEATURES. HTTP uses the services of TCP on well-known port 80. 24.1. HTTP TRANSACTION. Figure 24-1. HTTP transaction. Figure 24-2.

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Chapter 24

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  1. Chapter 24 Hypertext Transfer Protocol (HTTP)

  2. CONTENTS • HTTP TRANSACTION • REQUEST MESSAGE • RESPONSE MESSAGE • HEADER • EXAMPLES • SOME OTHER FEATURES

  3. HTTP uses the services of TCP on well-known port 80.

  4. 24.1 HTTP TRANSACTION

  5. Figure 24-1 HTTP transaction

  6. Figure 24-2 Message categories

  7. 24.2 REQUESTMESSAGE

  8. Figure 25-3 Request message

  9. Figure 24-4 Request line

  10. Figure 24-5 URL

  11. 24.3 RESPONSE MESSAGE

  12. Figure 24-6 Response message

  13. Figure 24-7 Status line Status code: Same format as FTP responses (three digits)

  14. 24.4 HEADER

  15. Figure 24-8 Header format

  16. Figure 24-9 Headers

  17. 24.5 EXAMPLES

  18. Example 1 This example retrieves a document. We use the GET method to retrieve an image with the path /usr/bin/image1.

  19. Figure 24-10 Example 1

  20. Example 2 This example retrieves information about a document. We use the HEAD method to retrieve information about an HTML document (see Chapter 25)

  21. Figure 24-11 Example 2

  22. Example 3 In this example, the client wants to send input data to the server. We use the POST method.

  23. Figure 24-12 Example 3

  24. 24.6 SOME OTHER FEATURES

  25. HTTP version 1.1 specifies a persistent connection by default.

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