RESTful Primer in Java

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Appendix RESTful Primer
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Response Headers
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Response headers from the server give the client metadata about the resource being returned Often, the response headers have matching corollaries in the request headers Here is a list of response headers that you will most often be concerned with: Age: 30 This gives the time the resource has been in proxy cache, in seconds Allow: GET, HEAD, PUT, DELETE This lists the HTTP methods allowed on the resource You saw this earlier, in the response to an OPTIONS request Cache-Control: max-age=120 This header allows either the client or server more control over caching than the default mechanisms These commands are intended for proxy caches that lie between the client and server 8, Load Balancing and Caching, covers this in greater detail Content-Encoding: gzip This tells the client the encoding of the response It is used for compression and gzip Content-Length: 234 This gives the length of the response body, in bytes Content-Type: application/json; charset=utf-8 This tells the client the MIME type of the response This should match up with one of the types in the Accept header from the request ETag: sdlkf234 The ETag gives a unique identifier of some sort for the resource This identifier should match up with the version of the resource in some way This could be an ID combined with a last_updated field or a hash of the 2 or some other value This is used for caching purposes and matches with the If-None-Match request header Expires: Wed, 01 Jul 2009 09:02:12 GMT This tells the client or a proxy cache when a response should be considered stale Either of these can verify whether the resource is up-to-date for a later request Last-Modified: Wed, 01 Jul 2009 09:03:45 GMT This is another caching mechanism This matches up with the client-side header If-Modified-Since Thus, with later requests for the same resource, the client can use the Last-Modified value for If-Modified-Since Set-Cookie: user_id=paul This sets the client-side cookie
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HTTP Status Codes
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Status codes are three-digit integers that specify the status of a response With regard to our RESTful services, status codes should be used as part of the API and the uniform interface While REST doesn t state a specific need for the use of status codes,
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Conclusion
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it is generally considered good design practice to conform to the definitions of HTTP The first digit of the status code indicates the general nature of the response Here are the classes of responses from the W3 definition: 1xx Informational status which states that the request has been received and is continuing 2xx Success status which states that the request was received and accepted 3xx Redirection status which states that to complete the request, further action must be taken at another URI 4xx Client error status which states that the request is either improperly formatted or cannot be completed for some reason 5xx Server error status which states that the server failed to complete the request despite it being valid One thing to note about status codes is that the HTTP methods often define which specific code should be taken on certain actions
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Conclusion
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REST and HTTP provide basic guidelines for building services While the exact definition of REST is debatable, we can focus on the set of constraints that make for a RESTful architecture Four constraints often resurface while you re designing services: Client/server REST is a client/server architecture Stateless The server contains no state between requests Cache Responses are labeled as cacheable or not cacheable Uniform interface Interactions between a client and a server should conform to a uniform interface
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At the center of RESTful design lies the concept of resources Resources are the objects that requests can be performed against They are addressable through URIs and have representations (format and language) The HTTP verbs are the building blocks of the uniform interface They can be roughly mapped to database actions and CRUD Here they are again: GET Maps to SQL SELECT PUT Maps to SQL UPDATE or INSERT with a specified key
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