Understanding Client-Server Communication Via Sockets

Understanding Client-Server Communication Via Sockets

Instructions/Descriptions

Understanding Client-Server Communication Via Sockets

Objectives

– To understand client-server communication via sockets.

– To gain exposure to the basic operations of a Web server and client.

– To explore basic structures of HTTP messages.

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Project Description In this project, you will be developing a multithreaded Web server and a simple web client. The Web server and Web client communicate using a text-based protocol called HTTP (Hypertext Transfer Protocol). Requirements for the Web server – The server is able to handle multiple requests concurrently.

This means the implementation is multithreaded. In the main thread, the server listens to a specified port, e.g., 8080. Upon receiving an HTTP request, the server sets up a TCP connection to the requesting client and serves the request in a separate thread. After sending the response back to the client, it closes the connection. – The server is assumed to work with HTTP GET messages.

If the requested file exists, the server responds with “HTTP/1.1 200 OK” together with the requested page to the client, otherwise it sends a corresponding error message, e.g., “HTTP/1.1 404 Not Found” or “HTTP/1.1 400 Bad Request”. – If running the server program using command line, the syntax should be: server_code_name [<port_number>] where the optional <port_number> is the port on which the server is listening to connections from clients.

If the port number is not entered, the default port 8080 is used. – You can test your Web server implementation on your local machine using a Web browser, e.g., Internet Explorer, Firefox, or Chrome. You need to specify the used port number within the URL, for example, http://localhost:8080/index.htm If omitting the port number portion, i.e., 8080, the browser will use the default port 80.

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– The server should response with a default page when users do not enter a specific page in the URL, for example, http://localhost:8080/ It should also work when the request includes a path to the requested file, for example, http://localhost:8080/path/to/file/example.htm

– You should display/log the request and header lines of request messages on the server for the purpose of debugging. Requirements for the simple Web client – The client is able to connect to the server via a socket and to request a page on the server. – Upon receipt of the response message from the server, the client extracts and displays/logs the message status, and then retrieves the page content from the message body.

– Submit a single zipped file with the naming convention <your_UTA_id>_<your_name>.zip which consists of:

• Source codes of the Web server and client,
• Any additional files required to run your codes,
• A readme file with instructions on how to compile and run your codes. You must mention the IDE as well as any packages that are required to run the codes. – Do NOT include any runnable executable (binary) program. – Make sure your name and your UTA ID are also listed in the readme file and in comments at the beginning of your source files. – Upload the zipped file via Canvas.

Please strictly follow the naming convention of the zipped file and the subject title. – Late submission will be accepted with a 10-point deduction for each extra day.   Additional Requirements/Instructions – Complete documentation and instructions for running the codes are recommended, otherwise you may be asked to come give the TA a demo if he is not able to run your programs from the instructions provided.

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If you are using any code from some external source or book, you MUST mention it explicitly in the codes as well as the readme file. Otherwise, it will be considered plagiarism and your project will not be evaluated. – You can discuss with other classmates on steps/algorithms to implement the project. However, the source codes must be written yourself.

Grading (30 points) – The server works correctly with requests from a Web browser (6 points) – The server can serve multiple requests at the same time (multithreaded implementation) (6 points)  – The client sends/receives messages to/from the server correctly (6 points) – The client extracts the status and content of messages from the server correctly (6 points) – Display/log of proper messages on the server (2 points) – Display/log of proper messages on the client (2 points) – Code do

Understanding Client-Server Communication Via Sockets

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