By Alan Harris

Make the most of Sinatra, the Ruby-based internet program library and domain-specific language utilized by GitHub, LinkedIn, Engine backyard, and different in demand agencies. With this concise e-book, you are going to speedy achieve operating wisdom of Sinatra and its minimalist method of construction either standalone and modular internet purposes. Sinatra serves as a light-weight wrapper round Rack middleware, with syntax that maps heavily to services uncovered through HTTP verbs, which makes it excellent for net companies and APIs. when you have event construction functions with Ruby, you are going to speedy research language basics and notice under-the-hood innovations, with assistance from a number of functional examples. Then you will get hands-on adventure with Sinatra via development your personal web publication engine.

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Benefit from Sinatra, the Ruby-based internet software library and domain-specific language utilized by GitHub, LinkedIn, Engine backyard, and different sought after corporations. With this concise publication, you'll quick achieve operating wisdom of Sinatra and its minimalist method of development either standalone and modular internet functions.

Extra resources for Sinatra: Up and Running: Ruby for the Web, Simply

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Many URLs, Similar Behaviors Sometimes you may encounter situations where multiple routes should respond the same way. We’re always trying to keep our code DRY, and luckily there is an approach that comes in handy without being unwieldy; Example 2-2 demonstrates how to respond to an array of routes by verb. ” Example 2-2. info "Triggered #{route} via POST" end put route do "Triggered #{route} via PUT" end delete route do "Triggered #{route} via DELETE" end patch route do "Triggered #{route} via PATCH" end end Notice that the URLs in Example 2-2 do not have trailing slashes.

Some frameworks circumvent this by providing a hidden field whose value represents the verb to use, and you can certainly use the other verbs via JavaScript and client libraries. info GET, PUT, and DELETE are expected to exhibit what is termed idempotence: an action that is idempotent should deliver identical results if the action is repeated. POST is not considered idempotent as repeated POST requests may continually update the server and return different results. PATCH PATCH is used to update a portion of a resource; this is in contrast to PUT, which replaces it wholesale.

1... info * Closing connection #0 This resource has an ETag value of 448c1ee0-cab2-012e-0f5e-482a14372ddf. The server will send the ETag header, but the client will send If-NoneMatch to the server to validate the ETag. If you want to check ETag values from the client in your application code, look for If-None-Match. Sessions Although HTTP is itself a stateless protocol, one way to maintain the state for a user is through the use of cookie-based sessions, demonstrated in Example 2-33. session) is stored client-side and used to house data related to the activity in the current user’s session.

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