1. Tools for Web Applications

2. Overview of TCP/IP Link Layer Network Layer Transport Layer Application Layer

3. Protocol Stack Diagram

4. Application Layer FTP, HTTP, telnet, etc. Provides ways for users to interact with the network

5. Transport Layer Transmission Control Protocol(TCP): communicates using sockets (IP address and port#), provides reliable connection User Data Protocol(UDP): allows applications to send raw IP datagrams

6. Network Layer Uses Internet Protocol (IP) Uses IP addresses IP header contains source address, destination address, version, length, checksum, etc.

7. Link Layer Physical interface Device driver Communicates with the actual network hardware

9. Hypertext Transfer Protocol(HTTP) Allows clients to request files/other resources from a server ASCII Protocol – easy to talk to

11. HTTP Request Methods GET - Request to read a web page or whatever information is identified by the request- URI POST - Append to a named resource (e.g. a Web page), or provide a block of data to a data-handling process at the server HEAD - Request to read a web page's header PUT - Request to store a web page DELETE - Remove a web page LINK - Connects two existing resources UNLINK - Breaks an existing connection between two resources

12. Example Type: telnet www.stanford.edu 80 GET /class/ee281/index.html HTTP/1.0

13. Output HTTP/1.1 200 OK Date: Sat, 23 Nov 2002 06:35:44 GMT Server: Apache/1.3.26 WebAuth 2.5 (Unix) mod_ssl/2.8.10 OpenSSL/0.9.6e WebAuth/2.5 mod_fastcgi/2.2.12 Connection: close Content-Type: text/html EE281: Embedded System Design Laboratory ……………………

14. Status Codes 200 OK 201 Created 202 Accepted 204 No Content 301 Moved Permanently 302 Moved Temporarily 304 Not Modified 400 Bad Request 401 Unauthorized 403 Forbidden 404 Not Found 500 Internal Server Error 501 Not Implemented 502 Bad Gateway 503 Service Unavailable

15. EDTP Ethernet Development Board

18. Function Prototypes void show_regs(void); void show_packet(void); void tcp(void); void assemble_ack(void); void write_asix(unsigned char regaddr, unsigned char regdata); void read_asix(unsigned char regaddr); void get_packet(void); void setipaddrs(void); void cksum(void); void echo_packet(void); void send_tcp_packet(void); void arp(void); void icmp(void); void udp(void);

19. uIP – Free TCP/IP Stack for AVR

26. Websites uIP: http://www.dunkels.com/adam/uip EDTP Ethernet Board: http://www.edtp.com HTTP: http://www.graphcomp.com/info/specs/http10.html TCP/IP: http://www4.ulpgc.es/tutoriales/tcpip/pru/3376fm.htm http://www.acm.org/crossroads/xrds1-1/tcpjmy.html