1. Uniform Resource Locators
Scheme
Port Number
Query
Host Name
Hierarchical portion
CS 190 Lecture Notes: HTTP Design Exercise

2. CS 190 Lecture Notes: HTTP Design Exercise
HTTP GET Request
Method
URL
Protocol Version
GET /statuses/user_timeline?my_id=100 HTTP/1.1
Host:
User-Agent: Mozilla/5.0
Accept: text/html, */*
Accept-Language: en-us
Accept-Charset: ISO ,utf-8
Connection: keep-alive
blank line
Headers
Body (empty)
CS 190 Lecture Notes: HTTP Design Exercise

3. CS 190 Lecture Notes: HTTP Design Exercise
HTTP POST Response
Version
Status
Status Message
HTTP/ OK
Date: Thu, 24 Jul :36:27 GMT
Server: Tweeter/1.0
Content-Type: application/json;charset=UTF-8
Content-Length: 266
blank line
{"tweets":
[{"id": 20006, "user": 100,
"time": "Mon Oct 27 18:02:57 PDT 2014",
"text": "I’m at home now"},
... ] }
Headers
Body
CS 190 Lecture Notes: HTTP Design Exercise

4. CS 190 Lecture Notes: HTTP Design Exercise
Example Requests
POST /friendships/create?my_id=100&user_id=200
User 100 becomes a follower of user 200
POST /friendships/destroy?my_id=100&user_id=200
User 100 is no longer a follower of user 200
GET /friends/ids.json?user_id=100
Return ids for all users that user 100 is following: [100, 84, 290, 16]
POST /statuses/update?my_id=100&status=Sleepy
Create a new tweet for user 100
CS 190 Lecture Notes: HTTP Design Exercise

5. CS 190 Lecture Notes: HTTP Design Exercise
Java Network APIs
serverSocket = new ServerSocket(portNumber);
Open a socket for server to accept connections
Containing application provides the port number
socket = serverSocket.accept(); reader = new InputStreamReader( socket.getInputStream());
Wait for next incoming connection
socket.close()
Close specific connection to client
All socket calls can throw IOException
CS 190 Lecture Notes: HTTP Design Exercise