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The document discusses security vulnerabilities in a simple Java web server code example. It shows how an attacker could cause a denial of service attack by sending a malformed HTTP request. To prevent this, the code needs to handle exceptions carefully by disconnecting from any client that sends a malformed request. The document also emphasizes the importance of careful exception handling in building security into applications from the start.
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[Type text] ECET465
Project 2Project Assignment 2: Building a Multi-Threaded Web Server
This project assignment is due at the end of the seventh week of the course and is worth 7% of your total grade.
In this project, we will develop a Web server in two steps. In the end, you will have built a multi-threaded Web server that is capable of processing multiple simultaneous service requests in parallel. Section 2.7 of your text may offer you some insight and help. You should be able to demonstrate that your Web server is capable of delivering your home page to a Web browser.
We are going to implement Version 1.0 of HTTP, as defined in RFC 1945, where separate HTTP requests are sent for each component of the Web page. The server will be able to handle multiple simultaneous service requests in parallel. This means that the Web server is multi-threaded. In the main thread, the server listens to a fixed port. When it receives a TCP connection request, it sets up a TCP connection through another port and services the request in a separate thread. To simplify this programming task, we will develop the code in two stages. In the first stage, you will write a multi-threaded server that simply displays the contents of the HTTP request message that it receives. After this program is running properly, you will add the code required to generate an appropriate response.
As you are developing the code, you can test your server from a Web browser. Just remember that you are not serving through the standard port 80, so you need to specify the port number within the URL that you give to your browser. For example, if your machine's name is host.someschool.edu, your server is listening to port 6789, and you want to retrieve the file index.html, then you would specify the following URL within the browser: http://host.someschool.edu:6789/index.html
If you omit ":6789," the browser will assume port 80, which most likely will not have a server listening on it.
When the server encounters an error, it sends a response message with the appropriate HTML source so that the error information is displayed in the browser window.
Web Server in Java: Part A
In the following steps, we will go through the code for the first implementation of our Web server. Wherever you see "?," you will need to supply a missing detail.
Our first implementation of the Web server will be multi-threaded, where the processing of each incoming request will take place inside a separate thread of execution. This allows the server to service multiple clients in parallel, or to perform multiple file transfers to a single client in parallel. When we create a new thread of execution, we need to pass to the Thread's constructor an instance of some class that implements the Runnable interface. This is the reason why we define a separate class called HttpRequest. The structure of the Web server is shown below: import java.io.* ;import java.net.* ;import java.util.* ;public final class WebServer{ public.
Project Assignment 2 Building a Multi-Threaded Web ServerThis pro.docx
Project Assignment 2: Building a Multi-Threaded Web Server
This project assignment is due at the end of the seventh week of the course and is worth 7% of your total grade.
In this project, we will develop a Web server in two steps. In the end, you will have built a multi-threaded Web server that is capable of processing multiple simultaneous service requests in parallel. Section 2.7 of your text may offer you some insight and help. You should be able to demonstrate that your Web server is capable of delivering your home page to a Web browser.
We are going to implement Version 1.0 of HTTP, as defined in
RFC 1945
, where separate HTTP requests are sent for each component of the Web page. The server will be able to handle multiple simultaneous service requests in parallel. This means that the Web server is multi-threaded. In the main thread, the server listens to a fixed port. When it receives a TCP connection request, it sets up a TCP connection through another port and services the request in a separate thread. To simplify this programming task, we will develop the code in two stages. In the first stage, you will write a multi-threaded server that simply displays the contents of the HTTP request message that it receives. After this program is running properly, you will add the code required to generate an appropriate response.
As you are developing the code, you can test your server from a Web browser. Just remember that you are not serving through the standard port 80, so you need to specify the port number within the URL that you give to your browser. For example, if your machine's name is
host.someschool.edu
, your server is listening to port 6789, and you want to retrieve the file
index.html
, then you would specify the following URL within the browser:
http://host.someschool.edu:6789/index.html
If you omit ":6789," the browser will assume port 80, which most likely will not have a server listening on it.
When the server encounters an error, it sends a response message with the appropriate HTML source so that the error information is displayed in the browser window.
Web Server in Java: Part A
In the following steps, we will go through the code for the first implementation of our Web server. Wherever you see "?," you will need to supply a missing detail.
Our first implementation of the Web server will be multi-threaded, where the processing of each incoming request will take place inside a separate thread of execution. This allows the server to service multiple clients in parallel, or to perform multiple file transfers to a single client in parallel. When we create a new thread of execution, we need to pass to the Thread's constructor an instance of some class that implements the
Runnable
interface. This is the reason why we define a separate class called
HttpRequest
. The structure of the Web server is shown below:
import java.io.* ;
import java.net.* ;
import java.util.* ;
public final class WebServer
{
public static void main(S.
Web Server.pdf
The document discusses creating a Node.js web server to handle HTTP requests and responses. It explains how to use the http core module to create a server, handle incoming requests, and send responses. The key points are:
1) The http.createServer() method is used to create a server and specify a callback function to handle requests.
2) Request objects provide information about the request like the URL and headers. Data from the request body can be read and concatenated.
3) Response objects allow sending back status codes, headers and body content to the client. Methods like write(), end(), and writeHead() are used to construct the response.
1)Building a MultiThreaded Web ServerIn this lab we will devel
1)Building a MultiThreaded Web Server
In this lab we will develop a Web server in two steps. In the end, you will have built a multithreaded
Web server that is capable of processing multiple simultaneous service requests in parallel. You should be able to demonstrate
that your Web server is capable of delivering your home page to a Web browser.
We are going to implement version 1.0 of HTTP, as defined in RFC 1945, where separate HTTP requests are sent
for each component of the Web page. The server will be able to handle multiple simultaneous service requests in
parallel. This means that the Web server is multithreaded.
In the main thread, the server listens to a fixed port.
When it receives a TCP connection request, it sets up a TCP connection through another port and services the
request in a separate thread. To simplify this programming task, we will develop the code in two stages. In the first
stage, you will write a multithreaded
server that simply displays the contents of the HTTP request message that it
receives. After this program is running properly, you will add the code required to generate an appropriate response.
As you are developing the code, you can test your server from a Web browser. But remember that you are not
serving through the standard port 80, so you need to specify the port number within the URL that you give to your
browser. For example, if your machine's name is host.someschool.edu, your server is listening to port 6789, and
you want to retrieve the file index.html, then you would specify the following URL within the browser:
http://host.someschool.edu:6789/index.html
If you omit ":6789", the browser will assume port 80 which most likely will not have a server listening on it.
When the server encounters an error, it sends a response message with the appropriate HTML source so that the
error information is displayed in the browser window.
Web Server in Java: Part A
In the following steps, we will go through the code for the first implementation of our Web Server. Wherever you see
"?", you will need to supply a missing detail.
Our first implementation of the Web server will be multithreaded,
where the processing of each incoming request
will take place inside a separate thread of execution. This allows the server to service multiple clients in parallel, or
to perform multiple file transfers to a single client in parallel. When we create a new thread of execution, we need to
pass to the Thread's constructor an instance of some class that implements the Runnable interface. This is the
reason that we define a separate class called HttpRequest. The structure of the Web server is shown below:
import java.io.* ;
import java.net.* ;
import java.util.* ;
public final class WebServer
{
public static void main(String argv[]) throws Exception
{
. . .
}
}
final class HttpRequest implements Runnable
{
. . .
}
Normally, Web servers process service requests that they receive thr ...
Socket Programming it-slideshares.blogspot.com
Socket programming allows applications on networked computers to communicate reliably using TCP or unreliably using UDP. A socket represents an open connection between two endpoints and has methods to get input/output streams, the remote host/port, and local port. A client socket connects to a server, while a server socket listens on a port and accepts connections from clients.
Mail Server Project Report
The Java Mail Server project allows clients to connect to a mail server to send and receive emails and attachments. The project is divided into three modules: a server module that uses server sockets to accept client connections, a client module that uses sockets to connect to the server, and an email inbox module that handles mail functions like forwarding, viewing attachments, and saving emails. The server stores details of client connections, mail sending and receiving. Clients can connect when the server is active to exchange emails with other clients. Usernames and passwords are stored in data files rather than a SQL server. The project provides automatic threading to handle socket connections and includes features for reliable TCP communication between clients.
Servlets
A server is a computer that responds to requests from clients like web browsers. Common requests include serving web pages, uploading/downloading files, and sending email. Apache is a popular web server software that runs on 66% of websites. It is feature-rich, efficient, robust, secure, and open source. A port is a software connection between a server and client used to identify the service, like port 80 for HTTP. Servlets are Java programs that extend functionality of web servers. They have advantages over CGI scripts like improved performance from residing in memory.
Servlets
This document provides an overview of servers, servlets, and related technologies. It defines that a server is a computer that responds to requests from clients, with typical requests including serving web pages and files. It introduces Apache as a popular web server, and notes that Tomcat is the servlet container that handles servlet requests for Apache. Finally, it defines that a servlet is a Java class that extends HttpServlet and overrides methods like doGet and doPost to respond to HTTP requests from clients.
T2
This document provides a tutorial on network programming in Java. It introduces Java network programming and the HTTP protocol. It discusses how Java uses sockets to establish connections between clients and servers. It also describes the Java URL class, which makes it easier to work with HTTP connections by abstracting away the low-level socket implementation. The tutorial provides examples of both an HTTP client and server implemented in Java using sockets and the URL class.
Sockets
The document discusses network programming and Java sockets. It introduces elements of client-server computing including networking basics like TCP, UDP and ports. It then covers Java sockets, explaining how to implement both a server and client using Java sockets. Code examples are provided of a simple server and client. The conclusion emphasizes that Java makes socket programming easier than other languages like C.
MCIS 6163 Assignment 1MCIS 6163 Assignment 1.pdfAssignmen
MCIS 6163 Assignment 1/MCIS 6163 Assignment 1.pdf
Assignment 1 – MCIS 6163
Building a Simple Web Client and a Multithreaded Web Server
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.
Due: April 14, 2020 11:59pm
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.
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.
If running the client program using command line, the syntax should be:
client_code_name <server_IPaddress/name> [<port_number>] [<requested_file_name>]
where the <server_IPaddress/name> is the IP address or name of the Web server, e.g., 127.0.0.1 or
localhost for the server running on the local machine. The optional < ...
MCIS 6163 Assignment 1MCIS 6163 Assignment 1.pdfAssignmen.docx
MCIS 6163 Assignment 1/MCIS 6163 Assignment 1.pdf
Assignment 1 – MCIS 6163
Building a Simple Web Client and a Multithreaded Web Server
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.
Due: April 14, 2020 11:59pm
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.
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.
If running the client program using command line, the syntax should be:
client_code_name <server_IPaddress/name> [<port_number>] [<requested_file_name>]
where the <server_IPaddress/name> is the IP address or name of the Web server, e.g., 127.0.0.1 or
localhost for the server running on the local machine. The optional <.
Server Side? Swift
This document discusses server-side Swift frameworks and deploying a Swift server application. It begins with an introduction to popular server-side Swift frameworks like Perfect, Vapor, Kitura, and Zewo. It then demonstrates building a simple REST API using the Perfect framework, including defining routes and handlers for GET and POST requests. It also shows connecting to a PostgreSQL database and performing queries. The document concludes by discussing deploying the Swift server application.
Node.js System: The Approach
The document discusses Node.js including:
1. An introduction to Node.js as an asynchronous event-driven JavaScript runtime for building scalable network applications.
2. Common internal Node.js modules like HTTP, File System, and Crypto.
3. Differences between JavaScript on Node.js and Java on JRE.
4. A sample HTTP server using the internal HTTP module to respond with "Hello World".
Socket Programming - nitish nagar
This document discusses network programming and Java sockets. It begins with an introduction to client-server computing and networking basics like TCP, UDP, and ports. It then covers Java sockets in detail, including how to implement a server that can accept multiple clients by creating a new thread for each, and how to implement a client. Sample code is provided for a simple single-threaded server and client. The document concludes that programming client-server applications in Java using sockets is easier than in other languages like C.
Network Programming Clients
This document discusses creating network clients in Java. It covers creating sockets, implementing a generic network client, parsing data with StringTokenizer, retrieving files from HTTP servers and documents using URL class. It provides code for a generic network client, parsing strings with StringTokenizer, an address verifier client, and classes to retrieve URIs and URLs. It also briefly discusses talking to servers interactively and using the URL class to write a basic web browser.
Servlets
This document provides information on Java servlets including: what servlets are and their advantages; the servlet architecture and lifecycle including initialization, processing requests via doGet and doPost methods, and destruction; how to deploy servlets in an application server; and how servlets handle form data submission. Servlets act as a middle layer between web requests and applications/databases, and allow dynamically generating web pages.
Unit 8 Java
The document provides an overview of object oriented programming and network programming concepts. It discusses topics like IP addresses, ports, sockets, client-server programming, and the java.net and java.util packages. The java.net package contains classes for network programming in Java like Socket, ServerSocket, URL, and InetAddress. The java.util package contains general-purpose utility classes like ArrayList, HashMap, Properties and Date.
Rpi python web
This document provides an overview of the Python web framework Flask. It discusses Flask's lightweight and extensible nature. It also covers key Flask concepts like URL routing, parameters, templates, and request handling. Examples are given for basic routing, parameter collection via GET and POST, and rendering templates with dynamic data. The document serves as an introduction to building web applications with the Flask framework in Python.
03 sockets
The document discusses network programming and the client-server model. It covers:
- The client-server exchange involves a client sending a request, the server handling the request and sending a response, and the client handling the response.
- Sockets provide a programming interface that allows network I/O to appear as file I/O. Clients and servers communicate by reading from and writing to socket file descriptors.
- Servers run as long-running daemon processes, listening on well-known ports for connection requests from clients. When a request is received, the server accepts the connection to form a connected socket for bidirectional data exchange.
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[Type text]ECET465Project 2Project Assignment 2 Building a Mul.docx
[Type text]ECET465Project 2Project Assignment 2 Building a Mul.docx
Project Assignment 2 Building a Multi-Threaded Web ServerThis pro.docx
Project Assignment 2 Building a Multi-Threaded Web ServerThis pro.docx
1)Building a MultiThreaded Web ServerIn this lab we will devel
1)Building a MultiThreaded Web ServerIn this lab we will devel
MCIS 6163 Assignment 1MCIS 6163 Assignment 1.pdfAssignmen
MCIS 6163 Assignment 1MCIS 6163 Assignment 1.pdfAssignmen
MCIS 6163 Assignment 1MCIS 6163 Assignment 1.pdfAssignmen.docx
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How information systems are built or acquired puts information, which is what they should be about, in a secondary place. Our language adapted accordingly, and we no longer talk about information systems but applications. Applications evolved in a way to break data into diverse fragments, tightly coupled with applications and expensive to integrate. The result is technical debt, which is re-paid by taking even bigger "loans", resulting in an ever-increasing technical debt. Software engineering and procurement practices work in sync with market forces to maintain this trend. This talk demonstrates how natural this situation is. The question is: can something be done to reverse the trend?
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This slide deck presents DLHT, a concurrent in-memory hashtable. Despite efforts to optimize hashtables, that go as far as sacrificing core functionality, state-of-the-art designs still incur multiple memory accesses per request and block request processing in three cases. First, most hashtables block while waiting for data to be retrieved from memory. Second, open-addressing designs, which represent the current state-of-the-art, either cannot free index slots on deletes or must block all requests to do so. Third, index resizes block every request until all objects are copied to the new index. Defying folklore wisdom, DLHT forgoes open-addressing and adopts a fully-featured and memory-aware closed-addressing design based on bounded cache-line-chaining. This design offers lock-free index operations and deletes that free slots instantly, (2) completes most requests with a single memory access, (3) utilizes software prefetching to hide memory latencies, and (4) employs a novel non-blocking and parallel resizing. In a commodity server and a memory-resident workload, DLHT surpasses 1.6B requests per second and provides 3.5x (12x) the throughput of the state-of-the-art closed-addressing (open-addressing) resizable hashtable on Gets (Deletes).
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Prompting language models is hard, while programming language models is easy. In this talk, I will discuss the state-of-the-art framework DSPy for programming foundation models with its powerful optimizers and runtime constraint system.
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Web
- 1. Web Security Programming I Building Security in from the Start Except where otherwise noted all portions of this work are Copyright (c) 2007 Google and are licensed under the Creative Commons Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/
Editor's Notes
- Now we walk through the code… Main() creates a SimpleWebServer object and calls its run() method. The run() method is just an infinite loop that waits for a connection from a client, and then attempts to process the request.
- Here is the SimpleWebServer object. First we initialize a variable that holds the port number the web server should listen to for connections from clients. Then we initialize a ServerSocket. Socket: The method of directing data to the appropriate application in a TCP/IP network. The combination of the IP address of the station and a port number make up a socket. Think of this like an electrical socket. A web server and a web client both have a “virtual” power strip with many sockets on it. A web client can talk to a server by selecting one of its sockets, and then selecting a server socket and plugging a virtual wire into each end. The run() method has an infinite loop waiting for a connection from a client. The call to ServerSocket accept() returns a socket object that corresponds to a unique socket on the server. This allows the server to communicate with the client. Once the communication is established, the client’s request is processed.
- processRequest() takes the client socket as input. It uses this socket to create BufferedReader and OutputStreamWriter objects. Once these communication objects are created, the method attempts to read a line of input from the client using the BufferedReader. We expect this line of input to be an HTTP GET request (as discussed earlier).
- The StringTokenizer object is used to break up the request into its constituent parts: GET, the pathname to the file the client would like to download. If the command is a “GET”, we call the serveFile() method, else we issue an error. Then we close the connection to the client.
- The first “if” removes the initial slash at the beginning of the pathname, and the second “if” sets the file to be downloaded = index.html, if another file was not specified.
- Now the method attempts to open the file and read it into the web server’s memory. If the FileReader object is unable to open the file and read a byte from it, it issues an error message.
- If the file was successfully opened, send the HTTP/1.0 200 OK message and then the method enters a while loop that reads bytes from the file and appends them to a StringBuffer, until the end of the file is reached. Then this StringBuffer is sent to the client.
- Trace the code, assuming a CR sent from the client. We read the line of input from the client. When we tokenize, the line: command = st.nextToken(); results in an exception. Control is returned to run() which does not handle the exception; then control is returned to main() which does not handle the exception either. Java terminates the application.
- Close the connection to the client, rather than crash the server…
- We also need to make sure the function fails in a secure manner.
- This is also a good example of a fail-safe approach: even if one or more components of a system fail, there is still some level of security.