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HTTP Response Messages Overview
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HTTP Response Messages Overview

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Questions and Answers

What information does the Content-Type: header line provide in an HTTP response message?

  • The type of content in the entity body. (correct)
  • The number of bytes of the object being sent.
  • The time when the object was created.
  • The status code of the request.

    • Which header line is crucial for object caching in both local clients and proxy servers?

  • Last-Modified: (correct)
  • Content-Length:
  • Server:
  • Content-Type:

    • What does a 301 status code indicate in an HTTP response?

  • The request was successful, and information is returned.
  • The client has issued a bad request.
  • The server encountered an error while processing the request.
  • The requested object has been permanently moved. (correct)

    • In an HTTP response message, which header line indicates the number of bytes in the object being sent?

    <p>Content-Length:</p> Signup and view all the answers

    What does the Server: header line in an HTTP response message indicate?

    <p>The web server generating the response.</p> Signup and view all the answers

    What is the purpose of the Last-Modified: header in an HTTP response?

    <p>To inform when the resource was last updated.</p> Signup and view all the answers

    Which of the following is NOT a common status code in HTTP response messages?

    <p>600 Invalid</p> Signup and view all the answers

    How is the object type indicated in an HTTP response message?

    <p>By the Content-Type header.</p> Signup and view all the answers

    What is the purpose of the cookie header line in the HTTP response message?

    <p>To set cookies for the user's browser</p> Signup and view all the answers

    What is included in a cookie file managed by the user's browser?

    <p>All cookies associated with the user’s sessions</p> Signup and view all the answers

    When does the server create an ID for a user in the backend database?

    <p>When the user first accesses the server</p> Signup and view all the answers

    What role does the back-end database play in cookie technology?

    <p>It stores user-specific records and states</p> Signup and view all the answers

    How does the user's browser access cookie data when the user returns to a site after a week?

    <p>By retrieving the relevant cookie from the cookie file</p> Signup and view all the answers

    What does DNS primarily provide for the Internet?

    <p>A directory service</p> Signup and view all the answers

    How do most users interact with DNS?

    <p>Indirectly through applications</p> Signup and view all the answers

    Which application layer functionality does DNS exemplify?

    <p>Network-name to network-address translation</p> Signup and view all the answers

    What aspect of users’ interaction does the Web significantly differ from traditional media?

    <p>It allows content retrieval at any time.</p> Signup and view all the answers

    What is one significant advantage of the Web over traditional broadcast media?

    <p>Users receive what they want when they want it.</p> Signup and view all the answers

    What is the response status code for a generic error indicating a request could not be understood?

    <p>400 Bad Request</p> Signup and view all the answers

    Which command should be used to view a response message including the base HTML file?

    <p>GET</p> Signup and view all the answers

    Which status code indicates that the requested HTTP protocol version is not supported?

    <p>505</p> Signup and view all the answers

    What is the correct format for an HTTP response as per the provided content?

    <p>status line, header fields, blank line, body</p> Signup and view all the answers

    What is the purpose of using the HEAD method instead of the GET method?

    <p>To fetch only headers without the body</p> Signup and view all the answers

    Which of the following phrases describes a 404 status code?

    <p>Requested document does not exist on the server</p> Signup and view all the answers

    What is denoted by the CR LF sequence in an HTTP response message?

    <p>End of the header field</p> Signup and view all the answers

    What does the HTTP server do with the request messages it receives?

    <p>Processes the request and sends response messages.</p> Signup and view all the answers

    What protocol does HTTP use for its underlying transport?

    <p>TCP</p> Signup and view all the answers

    How does TCP ensure the reliability of data transfer for HTTP messages?

    <p>By resending messages until acknowledged.</p> Signup and view all the answers

    What happens when a client sends a message into its socket interface?

    <p>The message goes out of the client’s control and is handled by TCP.</p> Signup and view all the answers

    What does the layered architecture of HTTP enable it to do?

    <p>Manage data loss and recovery independently of TCP.</p> Signup and view all the answers

    What does the server do when a client requests the same object multiple times in quick succession?

    <p>It resends the requested object without any acknowledgment.</p> Signup and view all the answers

    What is the primary role of the socket interface for the HTTP client?

    <p>To serve as a bridge between the client process and the TCP connection.</p> Signup and view all the answers

    Which statement accurately reflects how the server manages client state information?

    <p>The server does not store any state information about clients.</p> Signup and view all the answers

    Which layer of the protocol stack is responsible for recovering from data loss during transmission?

    <p>Transport layer</p> Signup and view all the answers

    How do the browser and the server access TCP for communication?

    <p>Using their respective socket interfaces.</p> Signup and view all the answers

    Study Notes

    HTTP Response Messages

    • The Server: header line identifies the web server (like User-agent: in HTTP requests).
    • Last-Modified: header shows the object's creation or last modification time; crucial for caching.
    • Content-Length: header specifies the object's size in bytes.
    • Content-Type: header indicates the object type (e.g., HTML), not relying on file extensions.
    • HTTP response message format: status line (version, status code, phrase), header lines, blank line, entity body.
    • Common status codes:
      • 200 OK: Successful request.
      • 301 Moved Permanently: Object moved; new URL in Location: header.
      • 400 Bad Request: Server couldn't understand the request.
      • 404 Not Found: Requested document doesn't exist.
      • 505 HTTP Version Not Supported: Server doesn't support the HTTP version.
    • To see an HTTP response, use telnet to connect to a web server, send a request (e.g., GET), and examine the response. Using HEAD instead of GET only retrieves headers, not the object itself.
    • HTTP uses TCP for reliable data transfer, ensuring message integrity. This is handled by lower layers, making HTTP independent of loss or reordering concerns.
    • Servers are stateless; they don't remember past interactions with clients.

    Web and HTTP

    • Before the early 1990s, internet use was primarily among researchers, for tasks like remote login, file transfer, and email.
    • The World Wide Web's arrival in the early 1990s made the internet accessible to the general public.
    • The Web's on-demand nature, unlike traditional broadcast media, is a key appeal, offering users content when they want it.

    Cookies

    • Four components of cookie technology:
      • Cookie header line in HTTP response messages.
      • Cookie header line in HTTP request messages.
      • Cookie file on the user's system, managed by their browser.
      • Backend database at the website.
    • Example: When a user first interacts with a site, the server creates an ID and stores it in the database and sends a cookie to the client. Subsequent visits use cookies to identify the user and retrieve their information stored in the database.

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    Related Documents

    ch2.pdf

    Description

    This quiz covers the essential components of HTTP response messages, including header lines and common status codes. Learn about important headers like Server:, Content-Type:, and how to interpret various status codes such as 200 OK and 404 Not Found. Understand the format of HTTP responses and how to examine them using tools like telnet.

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