EDA095 Uniform Resource Locators (URLs) and HTML Pages
|
|
|
- Lionel Butler
- 7 years ago
- Views:
Transcription
1 EDA095 Uniform Resource Locators (URLs) and HTML Pages Pierre Nugues Lund University March 30, 2016 Covers: Chapter 5, Java Network Programming, 4 th ed., Elliotte Rusty Harold Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
2 The Web Everybody knows what the web is. No need to present it. When it started, it was a combination of three main features: A document format in plain text: HTML derived from the older and clumsy SGML A communication protocol to transfer data: HTTP A way to name and address objects on the network: URLs We will review ways to handle URLs and HTML directly from Java. Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
3 Uniform Resource Locators (URL) A URL is the name of a resource on the Internet and an access mode. It goes beyond data that can be exchanged using HTTP. It can extend to FTP, telnet, mail protocols, and many more. In its simplest form, a URL is a string that consists of three parts: protocol://hostname/path/object The protocol can be http, ftp, telnet, rmi, etc. The hostname is an Internet address such as cs.lth.se or The path/object corresponds for instance to /home/pierre/file.html URLs are defined by RFC 2396 and RFC ( Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
4 URL (Continued) Protocols have a default port. The URL can specify a new one: A URL can be absolute or relative to a base URL The link labs.html in a document whose URL is has the URL Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
5 The URL Class The URL class defines a way to build and parse URL strings Constructors: URL(String spec) URL(String protocol, String host, String file) URL(URL context, String spec) The last one creates a URL by parsing the given spec within a specified context. The constructor throws a MalformedURLException if it fails to create the URL Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
6 A First Program Using the URL Class Creating URLs The constructor does not check the syntax. See MyDoc3 import java.net.*; public class MyURL { public static void main(string[] args) { try { URL mydoc1 = new URL(" URL mydoc2 = new URL("http", " "/index.html"); URL mydoc3 = new URL("http", " "index.html"); URL mydoc4 = new URL(new URL(" "labs.shtml"); URL mydoc5 = new URL(new URL(" "labs.shtml"); } catch (Exception e) { } } } //MyURL.java Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
7 Client and Server Communications Using HTTP The communication between a server and a client in its simplest form starts with a TCP connection from the client to port 80. Then we have the exchange: The client sends a request The server sends a response. Both request and response messages feature a header that consists of parameter-value pairs In addition: The request consists of a command word (HTTP method) to identify the request, parameters, and possibly other data. The response consists of a response code and objects to be displayed or rendered by the client Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
8 HTTP Request The request behind the URL consists of: 1 HTTP method, URL, version GET /pierre_nugues HTTP/1.1 2 Sequence of parameter names (46 types) followed by : and values pairs Name: Value Accept: text/plain... Host: cs.lth.se User-Agent: Mozilla/4.0 3 Empty line: \r\n 4 Possibly a message body (data) whose size is given by the Content-Length attribute RFC 2616 ( Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
9 HTTP Response Servers send a response: header followed by data 1 Protocol, status code, textual phrase HTTP/ OK 2 Sequence of parameter names followed by : and values Date: Wed, 28 Mar :12:54 GMT Server: Apache/ (sparc-sun-solaris2.8)... Connection: close 3 Empty line: \r\n 4 Data <html>... </html> Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
10 Getting Data from a Server In its simplest form, the client does not send data It just requests the content of the URL file For HTTP, the corresponding methods are GET or POST. The method is sent automatically by the URL class and is hidden to the programmer. We will review the steps to get data from simple to more complex The URL class uses GET by default, hides the header details, and receives data Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
11 Getting Data from a Server The URL class has methods to open a connection from a URL: InputStream openstream() //Opens a connection and returns an InputStream for reading from that connection. URLConnection openconnection() //Returns a URLConnection object. The opening methods will connect to the resource using the specified protocol Once open, the stream can be read and contain data sent by the server The protocol machinery (http, ftp, etc.) is invisible to the programmer We will first consider examples with openstream() The combination of the URL constructor and openstream() uses the GET method Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
12 Getting Data Using openstream() //ViewHTML.java try { URL mydoc = new URL(" InputStream is = mydoc.openstream(); BufferedReader breader = new BufferedReader(new InputStreamReader(is)); String line; while ((line = breader.readline())!= null) { System.out.println(line); } } catch (Exception e) { e.printstacktrace(); } Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
13 Relative URLs Using the 3rd constructor, we can create URLs relatively to a context (MyURL2.java) URL mydoc1 = new URL(" URL mydoc2 = new URL(myDoc1, "pierre.html"); URL mydoc3 = new URL(myDoc1, "/pierre.html"); URL mydoc4 = new URL(myDoc1, " URL mydoc5 = new URL(myDoc1, "mailto:pierre@cs.lth.se"); Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
14 URL Exceptions The description in the URL class exceptions Throws: MalformedURLException If the string specifies an unknown protocol. is not consistent with that of MalformedURLException: Thrown to indicate that a malformed URL has occurred. Either no legal protocol could be found in a specification string or the string could not be parsed. The URL constructor only checks the protocol. Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
15 Exceptions //MyURL3.java package url; import java.net.*; public class MyURL { public static void main(string[] args) { try { URL mydoc1 = new URL(" URL mydoc2 = new URL("http", " "index.html"); URL mydoc3 = new URL(new URL(" "labs.shtml"); URL mydoc4 = new URL(" } catch (Exception e) { e.printstacktrace(); } Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
16 Exceptions II } } try { URL mydoc5 = new URL("htp://// "); } catch (Exception e) { e.printstacktrace(); } try { URL mydoc6 = new URL("htp", " "index.html"); } catch (Exception e) { e.printstacktrace(); } Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
17 Methods of the URL Class Some useful methods are: String getprotocol() //Gets the protocol name. String gethost() //Gets the host name. int getport() //Gets the port number. String getpath() //Gets the path part and the file name. String getfile() //Gets the path, the file name, and the query if it exists. In fact nearly the same as getfile(), see documentation Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
18 Using URL Methods //myurl4.java URL mydoc1 = new URL(" URL mydoc2 = new URL("http", " "/index.html"); URL mydoc3 = new URL(" System.out.println("Protocols: "+ mydoc2.getprotocol() + " " + mydoc3.getprotocol()); System.out.println("Files: "+ mydoc2.getfile() + " " + mydoc3.getfile()); System.out.println("Ports: "+ mydoc2.getport() + " " + mydoc3.getport()); System.out.println("Hosts: "+ mydoc2.gethost() + " " + mydoc3.gethost()); Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
19 Testing Available Protocols Using the URL class, can we find protocols supported by a machine Idea: Create a set of URL objects and call getprotocol() Try: http, https, ftp, tftp, mailto, telnet, file, gopher, ladp, jar, nfs, jdbc, rmi, etc. and catch the errors... This is the idea of ProtocolTester.java, Elliotte Rusty Harold, Java Network Programming, page 186. The code available here: Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
20 Uniform Resource Identifiers (URI) URIs are name conventions close to URLs (RFC 2396) [scheme:]scheme-specific-part[#fragment] However, URIs do not provide a method to access a network resource. URIs can be absolute (with a scheme) or relative (without a scheme) URIs can also be: Opaque: The scheme-specific part does not begin with a /. They are not parsed as: mailto:java-net@java.sun.com, news:comp.lang.java, urn:isbn: x Hierarchical: They are absolute and begin with a / or they are relative and have no scheme as: or docs/guide/collections/designfaq.html#28 Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
21 Parsing a URI A hierarchical URI is parsed according to the syntax [scheme:][//authority][path][?query][#fragment] If the authority is a server, its syntax is: [user-info@]host[:port] The user info can consist of a user name and a password, anonymous:pierre@cs.lth.se on an anonymous ftp server Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
22 URI Methods The Java implementation of the URI class is more conformant than the URL one. The URI class has methods to build a URI from its components. Constructors: URI(String str) URI(String scheme, String ssp, String fragment) URI(String scheme, String userinfo, String host, int port, String path, String query, String fragment) It has Booleans to determine whether it is: opaque or hierarchical, isopaque() relative or absolute, isabslolute() Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
23 URI Methods The URI class has methods to parse a string (a hierarchical URI): [scheme:][//authority][path][?query][#fragment] String getscheme() String getauthority() String getpath() String getquery() String getfragment() URI parseserverauthority(), parses the authority, (String getuserinfo(), String gethost(), int getport()) URISplitter.java from Elliotte Rusty Harold, Java Network Programming, page 218. java url.urisplitter Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
24 Sending Data from the HTTP Client Clients can send data to HTTP servers using a list of parameter-value pairs: book=java Network Programming author=harold This is used when you fill in HTML forms, for instance GET and POST are the two methods to carry this out We review GET now Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
25 Sending Parameters with GET GET sends the list of parameter-value pairs in the URL in the query part: [scheme:][//authority][path][?query][#fragment] The parameter list must comply with a specific format and encoding for the accents: Arg1=Value1&Arg2=Value2 as in book=java+network+programming&author=harold The preferred encoding is UTF-8 The URLEncoder class carries this out with the method: static String encode(string s, String enc) Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
26 HTML Forms Web clients send data to servers using HTML forms Forms define the possible parameters that will be filled by the user with values Input components are defined by <input> elements with a type attribute. Possible types are hidden, text (default), radio, scroll down menus, submit buttons, reset, etc. Data in the form of pairs (parameter name, value) are sent using GET and POST methods. GET uses the URL string to send the parameters POST sends a MIME message Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
27 Example of Search Box The course home page: contains an input box: <input name="search" type="hidden" value="1" /> <input name="l" type="hidden" value="0" /> <input name="q" type="text" value="" class="field" /> <input name="start" type="hidden" value="1" /> <input name="no_cache" type="hidden" value="1" /> <input name="x" type="submit" value="sök" class="button" /> <input type="hidden" name="category" value="" /> </form> Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
28 Queries The query Nugues to the course home page is a sequence of pairs (name, value) start=1&no_cache=1&x=s%f6k&category= URISplitter extracts the query: search=1&l=0&q=nugues&start=1&no_cache=1&x=s?k&category= We can create a GET request using the URL constructor and send it to LTH using openstream() POST would send Content-Type: application/x-www-form-urlencoded Content-Length: 42 Connection: close s=1&so=1&i=sv&category=cs&q=nugues&x=s%f6k Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
29 Encoding Characters in URLs Some characters are encoded like Sök in our example From the Java specifications: The alphanumeric characters a through z, A through Z and 0 through 9 remain the same. The special characters., -, *, and _ remain the same. The space character is converted into a plus sign +. All other characters are unsafe and are first converted into one or more bytes using some encoding scheme. Then each byte is represented by the 3-character string %xy, where xy is the two-digit hexadecimal representation of the byte. The recommended encoding scheme to use is UTF-8. You have to encode the string explicitly with UTF-8 We will review UTF-8 and other types of encoding in a next lecture Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
30 Encoding Strings To demonstrate URLEncoder, we will use the program EncodeTest.java from Elliotte Rusty Harold, Java Network Programming, page 210. We call: URLEncoder.encode("Sök", "UTF-8"); URLEncoder.encode("Sök", "ISO "); URLEncoder.encode("This string has spaces", "UTF-8"); In the textbook, there is a mistake with the encoding option of javac It assumes that the editor saves the program in UTF-8. Thus is not always the case. Many editors use the machine s encoding, MacRoman on a Mac, Latin 1 on Linux... Use: pierre% javac -encoding UTF8 url/encodetest.java only if your program has been saved with UTF 8. Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
31 URL Decoders URLDecoder decodes a string encoded using UTF-8 in the machine s encoding It has one method: static String decode(string s, String enc) You have to decode the string explicitly with UTF-8 System.out.println(URLDecoder.decode("S%C3%B6k", "UTF-8")); System.out.println(URLDecoder.decode("S%F6k", "ISO ")); System.out.println(URLDecoder.decode("S%C3%B6k", "ISO ") System.out.println(URLDecoder.decode("S%F6k", "UTF-8")); (DecodeTest.java) Pierre Nugues EDA095 Uniform Resource Locators (URLs) and HTML Pages March 30, / 31
Learning Outcomes. Networking. Sockets. TCP/IP Networks. Hostnames and DNS TCP/IP
CP4044 Lecture 7 1 Networking Learning Outcomes To understand basic network terminology To be able to communicate using Telnet To be aware of some common network services To be able to implement client
Building a Multi-Threaded Web Server
Building a Multi-Threaded Web Server In this lab 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
Network Technologies
Network Technologies Glenn Strong Department of Computer Science School of Computer Science and Statistics Trinity College, Dublin January 28, 2014 What Happens When Browser Contacts Server I Top view:
Internet Technologies. World Wide Web (WWW) Proxy Server Network Address Translator (NAT)
Internet Technologies World Wide Web (WWW) Proxy Server Network Address Translator (NAT) What is WWW? System of interlinked Hypertext documents Text, Images, Videos, and other multimedia documents navigate
Web Programming. Robert M. Dondero, Ph.D. Princeton University
Web Programming Robert M. Dondero, Ph.D. Princeton University 1 Objectives You will learn: The fundamentals of web programming... The hypertext markup language (HTML) Uniform resource locators (URLs) The
HOST EUROPE CLOUD STORAGE REST API DEVELOPER REFERENCE
HOST EUROPE CLOUD STORAGE REST API DEVELOPER REFERENCE REST API REFERENCE REST OVERVIEW Host Europe REST Storage Service uses HTTP protocol as defned by RFC 2616. REST operations consist in sending HTTP
Lesson: All About Sockets
All About Sockets http://java.sun.com/docs/books/tutorial/networking/sockets/index.html Page 1 sur 1 The Java TM Tutorial Start of Tutorial > Start of Trail Trail: Custom Networking Lesson: All About Sockets
URLs and HTTP. ICW Lecture 10 Tom Chothia
URLs and HTTP ICW Lecture 10 Tom Chothia This Lecture The two basic building blocks of the web: URLs: Uniform Resource Locators HTTP: HyperText Transfer Protocol Uniform Resource Locators Many Internet
CGI An Example. CGI Model (Pieces)
CGI An Example go to http://127.0.0.1/cgi-bin/hello.pl This causes the execution of the perl script hello.pl Note: Although our examples use Perl, CGI scripts can be written in any language Perl, C, C++,
Different types of resources are specified by their scheme, each different pattern is implemented by a specific protocol:
Chapter 8 In this chapter we study the features of Java that allows us to work directly at the URL (Universal Resource Locator) and we are particularly interested in HTTP (Hyper Text Transfer Protocol).
1. When will an IP process drop a datagram? 2. When will an IP process fragment a datagram? 3. When will a TCP process drop a segment?
Questions 1. When will an IP process drop a datagram? 2. When will an IP process fragment a datagram? 3. When will a TCP process drop a segment? 4. When will a TCP process resend a segment? CP476 Internet
Socket programming. Complement for the programming assignment INFO-0010
Socket programming Complement for the programming assignment INFO-0010 Outline Socket definition Briefing on the Socket API A simple example in Java Multi-threading and Synchronization HTTP protocol Debugging
CTIS 256 Web Technologies II. Week # 1 Serkan GENÇ
CTIS 256 Web Technologies II Week # 1 Serkan GENÇ Introduction Aim: to be able to develop web-based applications using PHP (programming language) and mysql(dbms). Internet is a huge network structure connecting
FTP client Selection and Programming
COMP 431 INTERNET SERVICES & PROTOCOLS Spring 2016 Programming Homework 3, February 4 Due: Tuesday, February 16, 8:30 AM File Transfer Protocol (FTP), Client and Server Step 3 In this assignment you will
Data Communication I
Data Communication I Urban Bilstrup (E327) 090901 Urban.Bilstrup@ide.hh.se www2.hh.se/staff/urban Internet - Sweden, Northern Europe SUNET NORDUnet 2 Internet - Internet Addresses Everyone should be able
Creating a Simple, Multithreaded Chat System with Java
Creating a Simple, Multithreaded Chat System with Java Introduction by George Crawford III In this edition of Objective Viewpoint, you will learn how to develop a simple chat system. The program will demonstrate
Internet Technologies 4-http. F. Ricci 2010/2011
Internet Technologies 4-http F. Ricci 2010/2011 Content Hypertext Transfer Protocol Structure of a message Methods Headers Parameters and character encoding Proxy Caching HTTP 1.1: chunked transfer and
HTTP. Internet Engineering. Fall 2015. Bahador Bakhshi CE & IT Department, Amirkabir University of Technology
HTTP Internet Engineering Fall 2015 Bahador Bakhshi CE & IT Department, Amirkabir University of Technology Questions Q1) How do web server and client browser talk to each other? Q1.1) What is the common
WWW. World Wide Web Aka The Internet. dr. C. P. J. Koymans. Informatics Institute Universiteit van Amsterdam. November 30, 2007
WWW World Wide Web Aka The Internet dr. C. P. J. Koymans Informatics Institute Universiteit van Amsterdam November 30, 2007 dr. C. P. J. Koymans (UvA) WWW November 30, 2007 1 / 36 WWW history (1) 1968
HTTP Protocol. Bartosz Walter <Bartek.Walter@man.poznan.pl>
HTTP Protocol Bartosz Walter Agenda Basics Methods Headers Response Codes Cookies Authentication Advanced Features of HTTP 1.1 Internationalization HTTP Basics defined in
Mail User Agent Project
Mail User Agent Project Tom Kelliher, CS 325 100 points, due May 4, 2011 Introduction (From Kurose & Ross, 4th ed.) In this project you will implement a mail user agent (MUA) that sends mail to other users.
WIRIS quizzes web services Getting started with PHP and Java
WIRIS quizzes web services Getting started with PHP and Java Document Release: 1.3 2011 march, Maths for More www.wiris.com Summary This document provides client examples for PHP and Java. Contents WIRIS
The Application Layer. CS158a Chris Pollett May 9, 2007.
The Application Layer CS158a Chris Pollett May 9, 2007. Outline DNS E-mail More on HTTP The Domain Name System (DNS) To refer to a process on the internet we need to give an IP address and a port. These
600-152 People Data and the Web Forms and CGI CGI. Facilitating interactive web applications
CGI Facilitating interactive web applications Outline In Informatics 1, worksheet 7 says You will learn more about CGI and forms if you enroll in Informatics 2. Now we make good on that promise. First
Protocolo HTTP. Web and HTTP. HTTP overview. HTTP overview
Web and HTTP Protocolo HTTP Web page consists of objects Object can be HTML file, JPEG image, Java applet, audio file, Web page consists of base HTML-file which includes several referenced objects Each
World Wide Web. Before WWW
World Wide Web Joao.Neves@fe.up.pt Before WWW Major search tools: Gopher and Archie Archie Search FTP archives indexes Filename based queries Gopher Friendly interface Menu driven queries João Neves 2
How To Write A Program For The Web In Java (Java)
21 Applets and Web Programming As noted in Chapter 2, although Java is a general purpose programming language that can be used to create almost any type of computer program, much of the excitement surrounding
NetCom SMS Bedrift API - - - - - Technical Documentation
- - - - - Version 1.2 December 2008 TABLE OF CONTENTS 1 INTRODUCTION... 3 1.1 SCOPE... 3 1.2 REVISION HISTORY... 3 2 SOLUTION OVERVIEW... 4 3 LIMITATIONS... 5 3.1 NUMBER OF RECIPIENTS... 5 3.2 ORIGINATING
DNS: Domain Name System
DNS: Domain Name System People: many identifiers: SSN, name, passport # Internet hosts, routers: IP address (32 bit) - used for addressing datagrams name, e.g., ww.yahoo.com - used by humans Q: map between
LabVIEW Internet Toolkit User Guide
LabVIEW Internet Toolkit User Guide Version 6.0 Contents The LabVIEW Internet Toolkit provides you with the ability to incorporate Internet capabilities into VIs. You can use LabVIEW to work with XML documents,
Application layer Web 2.0
Information Network I Application layer Web 2.0 Youki Kadobayashi NAIST They re revolving around the web, after all Name any Internet-related buzz: Cloud computing Smartphone Social media... You ll end
By Bardia, Patit, and Rozheh
HTTP By Bardia, Patit, and Rozheh HTTP - Introduction - Hyper Text Transfer Protocol -uses the TCP/IP technology -has had the most impact on the World Wide Web (WWW) - specs in RFC 2616 (RFC2616) HTTP
The Web: some jargon. User agent for Web is called a browser: Web page: Most Web pages consist of: Server for Web is called Web server:
The Web: some jargon Web page: consists of objects addressed by a URL Most Web pages consist of: base HTML page, and several referenced objects. URL has two components: host name and path name: User agent
Socket Programming in Java
Socket Programming in Java Learning Objectives The InetAddress Class Using sockets TCP sockets Datagram Sockets Classes in java.net The core package java.net contains a number of classes that allow programmers
Evolution of the WWW. Communication in the WWW. WWW, HTML, URL and HTTP. HTTP Abstract Message Format. The Client/Server model is used:
Evolution of the WWW Communication in the WWW World Wide Web (WWW) Access to linked documents, which are distributed over several computers in the History of the WWW Origin 1989 in the nuclear research
B.Sc (Honours) - Software Development
Galway-Mayo Institute of Technology B.Sc (Honours) - Software Development E-Commerce Development Technologies II Lab Session Using the Java URLConnection Class The purpose of this lab session is to: (i)
Nuance Mobile Developer Program. HTTP Services for Nuance Mobile Developer Program Clients
Nuance Mobile Developer Program HTTP Services for Nuance Mobile Developer Program Clients Notice Nuance Mobile Developer Program HTTP Services for Nuance Mobile Developer Program Clients Copyright 2011
1945: 1989: ! Tim Berners-Lee (CERN) writes internal proposal to develop a. 1990:! Tim BL writes a graphical browser for Next machines.
Systemprogrammering 2009 Föreläsning 9 Web Services Topics! HTTP! Serving static content! Serving dynamic content 1945: 1989: Web History! Vannevar Bush, As we may think, Atlantic Monthly, July, 1945.
String sentence = new String(receivePacket.getData()); InetAddress IPAddress = receivepacket.getaddress(); int port = receivepacket.
164 CHAPTER 2 APPLICATION LAYER connection requests, as done in TCPServer.java. If multiple clients access this application, they will all send their packets into this single door, serversocket. String
What is Distributed Annotation System?
Contents ISiLS Lecture 12 short introduction to data integration F.J. Verbeek Genome browsers Solutions for integration CORBA SOAP DAS Ontology mapping 2 nd lecture BioASP roadshow 1 2 Human Genome Browsers
Wireshark Lab: HTTP. 1. The Basic HTTP GET/response interaction
Wireshark Lab: HTTP Version: 2.0 (Sept. 2009) 2009 J.F. Kurose, K.W. Ross. All Rights Reserved Computer Networking: A Topdown Approach, 5 th edition. Having gotten our feet wet with the Wireshark packet
An Overview of Java. overview-1
An Overview of Java overview-1 Contents What is Java Major Java features Java virtual machine Java programming language Java class libraries (API) GUI Support in Java Networking and Threads in Java overview-2
1 Introduction: Network Applications
1 Introduction: Network Applications Some Network Apps E-mail Web Instant messaging Remote login P2P file sharing Multi-user network games Streaming stored video clips Internet telephone Real-time video
1 Recommended Readings. 2 Resources Required. 3 Compiling and Running on Linux
CSC 482/582 Assignment #2 Securing SimpleWebServer Due: September 29, 2015 The goal of this assignment is to learn how to validate input securely. To this purpose, students will add a feature to upload
Evolution of the WWW. Communication in the WWW. WWW, HTML, URL and HTTP. HTTP - Message Format. The Client/Server model is used:
Evolution of the WWW Communication in the WWW World Wide Web (WWW) Access to linked documents, which are distributed over several computers in the History of the WWW Origin 1989 in the nuclear research
Introduction to the. Barracuda Embedded Web-Server
Introduction to the Barracuda Embedded Web-Server This paper covers fundamental concepts of HTTP and how the Barracuda Embedded Web Server can be used in an embedded device. Introduction to HTTP Using
OCS Training Workshop LAB13. Ethernet FTP and HTTP servers
OCS Training Workshop LAB13 Ethernet FTP and HTTP servers Introduction The training module will introduce the FTP and Web hosting capabilities of the OCS product family. The user will be instructed in
Bitrix Site Manager 4.0. Quick Start Guide to Newsletters and Subscriptions
Bitrix Site Manager 4.0 Quick Start Guide to Newsletters and Subscriptions Contents PREFACE...3 CONFIGURING THE MODULE...4 SETTING UP FOR MANUAL SENDING E-MAIL MESSAGES...6 Creating a newsletter...6 Providing
APACHE WEB SERVER. Andri Mirzal, PhD N28-439-03
APACHE WEB SERVER Andri Mirzal, PhD N28-439-03 Introduction The Apache is an open source web server software program notable for playing a key role in the initial growth of the World Wide Web Typically
MONETA.Assistant API Reference
MONETA.Assistant API Reference Contents 2 Contents Abstract...3 Chapter 1: MONETA.Assistant Overview...4 Payment Processing Flow...4 Chapter 2: Quick Start... 6 Sandbox Overview... 6 Registering Demo Accounts...
Chapter 3 Using Access Control Lists (ACLs)
Chapter 3 Using Access Control Lists (ACLs) Access control lists (ACLs) enable you to permit or deny packets based on source and destination IP address, IP protocol information, or TCP or UDP protocol
Email API Document. 2012 Webaroo Technology India Pvt. Ltd.
Email API Document 2012 Webaroo Technology India Pvt. Ltd. All rights reserved. No parts of this work may be reproduced in any form or by any means - graphic, electronic, or mechanical, including photocopying,
Package urltools. October 11, 2015
Type Package Package urltools October 11, 2015 Title Vectorised Tools for URL Handling and Parsing Version 1.3.2 Date 2015-10-09 Author Oliver Keyes [aut, cre], Jay Jacobs [aut, cre], Mark Greenaway [ctb],
HireDesk API V1.0 Developer s Guide
HireDesk API V1.0 Developer s Guide Revision 1.4 Talent Technology Corporation Page 1 Audience This document is intended for anyone who wants to understand, and use the Hiredesk API. If you just want to
Network Communication
Network Communication Outline Sockets Datagrams TCP/IP Client-Server model OSI Model Sockets Endpoint for bidirectional communication between two machines. To connect with each other, each of the client
13 File Output and Input
SCIENTIFIC PROGRAMMING -1 13 File Output and Input 13.1 Introduction To make programs really useful we have to be able to input and output data in large machinereadable amounts, in particular we have to
reference: HTTP: The Definitive Guide by David Gourley and Brian Totty (O Reilly, 2002)
1 cse879-03 2010-03-29 17:23 Kyung-Goo Doh Chapter 3. Web Application Technologies reference: HTTP: The Definitive Guide by David Gourley and Brian Totty (O Reilly, 2002) 1. The HTTP Protocol. HTTP = HyperText
Computer Networks. Lecture 7: Application layer: FTP and HTTP. Marcin Bieńkowski. Institute of Computer Science University of Wrocław
Computer Networks Lecture 7: Application layer: FTP and Marcin Bieńkowski Institute of Computer Science University of Wrocław Computer networks (II UWr) Lecture 7 1 / 23 Reminder: Internet reference model
FileMaker 14. ODBC and JDBC Guide
FileMaker 14 ODBC and JDBC Guide 2004 2015 FileMaker, Inc. All Rights Reserved. FileMaker, Inc. 5201 Patrick Henry Drive Santa Clara, California 95054 FileMaker and FileMaker Go are trademarks of FileMaker,
2- Electronic Mail (SMTP), File Transfer (FTP), & Remote Logging (TELNET)
2- Electronic Mail (SMTP), File Transfer (FTP), & Remote Logging (TELNET) There are three popular applications for exchanging information. Electronic mail exchanges information between people and file
The HTTP Plug-in. Table of contents
Table of contents 1 What's it for?... 2 2 Controlling the HTTPPlugin... 2 2.1 Levels of Control... 2 2.2 Importing the HTTPPluginControl...3 2.3 Setting HTTPClient Authorization Module... 3 2.4 Setting
Remote Access API 2.0
VYATTA A BROCADE COMPANY Vyatta System Remote Access API 2.0 REFERENCE GUIDE Vyatta A Brocade Company 130 Holger Way San Jose, CA 95134 www.brocade.com 408 333 8400 COPYRIGHT Copyright 2005 2015 Vyatta,
Forms, CGI Objectives. HTML forms. Form example. Form example...
The basics of HTML forms How form content is submitted GET, POST Elements that you can have in forms Responding to forms Common Gateway Interface (CGI) Later: Servlets Generation of dynamic Web content
Managing Users and Identity Stores
CHAPTER 8 Overview ACS manages your network devices and other ACS clients by using the ACS network resource repositories and identity stores. When a host connects to the network through ACS requesting
SWE 444 Internet and Web Application Development. Introduction to Web Technology. Dr. Ahmed Youssef. Internet
SWE 444 Internet and Web Application Development Introduction to Web Technology Dr. Ahmed Youssef Internet It is a network of networks connected and communicating using TCP/IP communication protocol 2
Internet Technologies Internet Protocols and Services
QAFQAZ UNIVERSITY Computer Engineering Department Internet Technologies Internet Protocols and Services Dr. Abzetdin ADAMOV Chair of Computer Engineering Department aadamov@qu.edu.az http://ce.qu.edu.az/~aadamov
1 SIP Carriers. 1.1 Tele2. 1.1.1 Warnings. 1.1.2 Vendor Contact. 1.1.3 Versions Verified Interaction Center 2015 R2 Patch1. 1.1.
1 SIP Carriers 1.1 Tele2 1.1.1 Warnings Check the SIP 3 rd Party SIP Carrier Matrix for certification status, and supported features. More info about the SIP 3 rd Party SIP Carrier Matrix can be found
Web. Services. Web Technologies. Today. Web. Technologies. Internet WWW. Protocols TCP/IP HTTP. Apache. Next Time. Lecture #3 2008 3 Apache.
JSP, and JSP, and JSP, and 1 2 Lecture #3 2008 3 JSP, and JSP, and Markup & presentation (HTML, XHTML, CSS etc) Data storage & access (JDBC, XML etc) Network & application protocols (, etc) Programming
ResellerPlus - Bulk Http API Specification. (This Document gives details on how to send messages via the Bulk HTTP API for the RouteSms SMPP System)
RouteSms ResellerPlus - Bulk Http API Specification (Document Version 1.0.0) (This Document gives details on how to send messages via the Bulk HTTP API for the RouteSms SMPP System) 1 P a g e HTTP API
Easy Setup Guide for the Sony Network Camera
-878-191-11 (1) Easy Setup Guide for the Sony Network Camera For setup, a computer running the Microsoft Windows Operating System is required. For monitoring camera images, Microsoft Internet Explorer
CONTENT of this CHAPTER
CONTENT of this CHAPTER v DNS v HTTP and WWW v EMAIL v SNMP 3.2.1 WWW and HTTP: Basic Concepts With a browser you can request for remote resource (e.g. an HTML file) Web server replies to queries (e.g.
Application Monitoring using SNMPc 7.0
Application Monitoring using SNMPc 7.0 SNMPc can be used to monitor the status of an application by polling its TCP application port. Up to 16 application ports can be defined per icon. You can also configure
Lecture 2. Internet: who talks with whom?
Lecture 2. Internet: who talks with whom? An application layer view, with particular attention to the World Wide Web Basic scenario Internet Client (local PC) Server (remote host) Client wants to retrieve
Grandstream Networks, Inc. GXP2130/2140/2160 Auto-configuration Plug and Play
Grandstream Networks, Inc. GXP2130/2140/2160 Auto-configuration Plug and Play Introduction: This is a technical guide targeted to PBX developers that want to learn the different mechanisms that GXP2130/2140/2160
Basic Internet programming Formalities. Hands-on tools for internet programming
Welcome Basic Internet programming Formalities Hands-on tools for internet programming DD1335 (gruint10) Serafim Dahl serafim@nada.kth.se DD1335 (Lecture 1) Basic Internet Programming Spring 2010 1 / 23
NETWORKING FEATURES OF THE JAVA PROGRAMMING LANGUAGE
50-20-44 DATA COMMUNICATIONS MANAGEMENT NETWORKING FEATURES OF THE JAVA PROGRAMMING LANGUAGE John P. Slone INSIDE Java s Target Environment, Networking Basics, Java Networking Primitives, Connection-Oriented
Chapter 27 Hypertext Transfer Protocol
Chapter 27 Hypertext Transfer Protocol Columbus, OH 43210 Jain@CIS.Ohio-State.Edu http://www.cis.ohio-state.edu/~jain/ 27-1 Overview Hypertext language and protocol HTTP messages Browser architecture CGI
URI and UUID. Identifying things on the Web.
URI and UUID Identifying things on the Web. Overview > Uniform Resource Identifiers (URIs) > URIStreamOpener > Universally Unique Identifiers (UUIDs) Uniform Resource Identifiers > Uniform Resource Identifiers
THE PROXY SERVER 1 1 PURPOSE 3 2 USAGE EXAMPLES 4 3 STARTING THE PROXY SERVER 5 4 READING THE LOG 6
The Proxy Server THE PROXY SERVER 1 1 PURPOSE 3 2 USAGE EXAMPLES 4 3 STARTING THE PROXY SERVER 5 4 READING THE LOG 6 2 1 Purpose The proxy server acts as an intermediate server that relays requests between
Sophos Mobile Control Network Access Control interface guide
Sophos Mobile Control Network Access Control interface guide Product version: 3.5 Document date: July 2013 Contents 1 About Sophos Mobile Control... 3 2 About Network Access Control integration... 4 3
Introduction to LAN/WAN. Application Layer (Part II)
Introduction to LAN/WAN Application Layer (Part II) Application Layer Topics Domain Name System (DNS) (7.1) Electronic Mail (Email) (7.2) World Wide Web (WWW) (7.3) Electronic Mail (Email) Mostly used
Applications and Services. DNS (Domain Name System)
Applications and Services DNS (Domain Name Service) File Transfer Protocol (FTP) Simple Mail Transfer Protocol (SMTP) Malathi Veeraraghavan Distributed database used to: DNS (Domain Name System) map between
The Web History (I) The Web History (II)
Goals of Today s Lecture EE 122: The World Wide Web Ion Stoica TAs: Junda Liu, DK Moon, David Zats http://inst.eecs.berkeley.edu/~ee122/ (Materials with thanks to Vern Paxson, Jennifer Rexford, and colleagues
The World-Wide Web Gateway to Hyper-G: Using a Connectionless Protocol to Access Session-Oriented Services
Diplomarbeit in Telematik, TU Graz Institut für Informationsverarbeitung und Computergestützte neue Medien The World-Wide Web Gateway to Hyper-G: Using a Connectionless Protocol to Access Session-Oriented
How to test and debug an ASP.NET application
Chapter 4 How to test and debug an ASP.NET application 113 4 How to test and debug an ASP.NET application If you ve done much programming, you know that testing and debugging are often the most difficult
COMP 112 Assignment 1: HTTP Servers
COMP 112 Assignment 1: HTTP Servers Lead TA: Jim Mao Based on an assignment from Alva Couch Tufts University Due 11:59 PM September 24, 2015 Introduction In this assignment, you will write a web server
HTML Forms and CONTROLS
HTML Forms and CONTROLS Web forms also called Fill-out Forms, let a user return information to a web server for some action. The processing of incoming data is handled by a script or program written in
SSL VPN Portal Options
1. ProSecure UTM Quick Start Guide This quick start guide describes how to use the SSL VPN Wizard to configure SSL VPN portals on the ProSecure Unified Threat Management (UTM) Appliance. The Secure Sockets
CS640: Introduction to Computer Networks. Applications FTP: The File Transfer Protocol
CS640: Introduction to Computer Networks Aditya Akella Lecture 4 - Application Protocols, Performance Applications FTP: The File Transfer Protocol user at host FTP FTP user client interface local file
ipayment Gateway API (IPG API)
ipayment Gateway API (IPG API) Accepting e-commerce payments for merchants Version 3.2 Intercard Finance AD 2007 2015 Table of Contents Version control... 4 Introduction... 5 Security and availability...
Web Development. Owen Sacco. ICS2205/ICS2230 Web Intelligence
Web Development Owen Sacco ICS2205/ICS2230 Web Intelligence Introduction Client-Side scripting involves using programming technologies to build web pages and applications that are run on the client (i.e.
JASPERREPORTS SERVER WEB SERVICES GUIDE
JASPERREPORTS SERVER WEB SERVICES GUIDE RELEASE 5.0 http://www.jaspersoft.com JasperReports Server Web Services Guide Copyright 2012 Jaspersoft Corporation. All rights reserved. Printed in the U.S.A. Jaspersoft,
Division of Informatics, University of Edinburgh
CS1Bh Lecture Note 20 Client/server computing A modern computing environment consists of not just one computer, but several. When designing such an arrangement of computers it might at first seem that
Web Application Forensics:
Web Application Forensics: The Uncharted Territory By Ory Segal, Sanctum Security Group Introduction If criminals would always schedule their movements like railway trains, it would certainly be more convenient
Creating Form Rendering ASP.NET Applications
Creating Form Rendering ASP.NET Applications You can create an ASP.NET application that is able to invoke the Forms service resulting in the ASP.NET application able to render interactive forms to client
Capario B2B EDI Transaction Connection. Technical Specification for B2B Clients
Capario B2B EDI Transaction Connection Technical Specification for B2B Clients Revision History Date Version Description Author 02/03/2006 Draft Explanation for external B2B clients on how to develop a
Bitrix Site Manager 4.1. User Guide
Bitrix Site Manager 4.1 User Guide 2 Contents REGISTRATION AND AUTHORISATION...3 SITE SECTIONS...5 Creating a section...6 Changing the section properties...8 SITE PAGES...9 Creating a page...10 Editing
10. Java Servelet. Introduction
Chapter 10 Java Servlets 227 10. Java Servelet Introduction Java TM Servlet provides Web developers with a simple, consistent mechanism for extending the functionality of a Web server and for accessing
Communicating with a Barco projector over network. Technical note
Communicating with a Barco projector over network Technical note MED20080612/00 12/06/2008 Barco nv Media & Entertainment Division Noordlaan 5, B-8520 Kuurne Phone: +32 56.36.89.70 Fax: +32 56.36.883.86
Technical documentation
Technical documentation HTTP Application Programming Interface SMPP specifications Page 1 Contents 1. Introduction... 3 2. HTTP Application Programming Interface... 4 2.1 Introduction... 4 2.2 Submitting