REST web services communicate over the HTTP specification, using HTTP vocabulary: Methods (GET, POST, etc.) HTTP URI syntax (paths, parameters, etc.) Media types (xml, json, html, plain text, etc) The objective of this presentation to understand basic concept of HTTP Request and Response message header which would help while implementing REST APIS

1. Developing RESTful APIs using JAX-RS
HTTP MESSAGES

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3. HTTP Communication

4. HTTP Request Message
HTTP request message is sent from the client (Brower) to HTTP Web-Server.
Request message contain:
 location of a resource or resource URI
 HTTP method to use when accessing the resource.
 Optional request headers (name-value pairs) providing additional
information
 Request body that identifies additional data to be uploaded to the
server (e.g. form parameters, attachments, etc.)

5. HTTP Response Message
HTTP response message is sent from HTTP Web-Server back to the client
(Web-Browser).
Response message contain:
 Carry status of processed request.
 Provide response headers (name-value pairs) providing additional
information about the response
 Supplies optional response body that identifies additional data to be
downloaded to the server (e.g. html, images, attachments etc.

6. HTTP Request and Response Message

7. HTTP Request/ Response Message Format
Request

8. HTTP Request Line
/fruits/list?category=fruits&limits=20
Path to resource Query string
HTTP /1.1

9. HTTP Methods

10. HTTP General Header
Request/ Response General Header
 Carry information about the HTTP transaction
 Can be a part of request, as well as response
General Headers

11. HTTP Request Header
Request Header
 Specific to an HTTP Request
 Carry information about the client, and the type of request
 Facilitates better understanding between client and server
Request Headers

12. HTTP Entity Header
Request/ Response Entity Header
 Carry information about the content
 Mainly part of HTTP Response
Entity Headers

13. HTTP Response Status code
Response Status Code
 Indicate the server’s processed status corresponding to a request
 Combination of a numerical code, and a short description