Constraining Request Methods in Java

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226 Constraining Request Methods
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It s possible (and often desirable) to limit the HTTP method used to access a route You accomplish that using the :via parameter of the route:
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match 'products/:id' => 'products#show', :via => :get
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Again, since this is a common thing to do, Rails provides a shorthand way of expressing this particular constraint, by replacing match with the HTTP method desired (get, post, etc)
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22 The routesrb File
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get 'products/:id' => 'products#show' post 'products' => 'products#create'
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If, for some reason, you want to constrain a route to more than one HTTP method, you can pass :via an array of verb names
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match 'products/:id' => 'products#show', :via => [:get, :post]
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Routes
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227 Redirect Routes
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It s possible to code a redirect directly into a route definition, using the redirect method:
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match "/foo", :to => redirect("/bar")
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The argument to redirect can contain either a relative URL or a full URI
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match "/google", :to => redirect("http://googlecom/")
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The redirect method can also take a block, which receives the request params as its argument This allows you to, for instance, do quick versioning of web service API endpoints2
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match "/api/v1/:api", :to => redirect {|params| "/api/v2/#{params[:api]pluralize}" }
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The redirect method also accepts an optional :status parameter
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match "/api/v1/:api", :to => redirect(:status => 302) {|params| "/api/v2/#{params[:api]pluralize}" }
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The redirect method returns a simple Rack endpoint, as we can see by examining its source code
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def redirect(*args, &block) options = argslastis_a (Hash) argspop : {} path = argsshift || block path_proc = pathis_a (Proc) path : proc { |params| path % params } status = options[:status] || 301 lambda do |env| req = Requestnew(env) params = [reqsymbolized_path_parameters] params << req if path_procarity > 1
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2 Examples drawn from Yehuda Katz s excellent blog post about generic actions in Rails 3 routes at
http://yehudakatzcom/2009/12/20/generic-actions-in-rails-3/
uri = URIparse(path_proccall(*params)) urischeme ||= reqscheme urihost ||= reqhost uriport ||= reqport unless reqstandard_port
2: Routing
body = %(<html><body>You are being <a href="#{ERB::Utilh(urito_s)}">redirected</a></body></html>) headers = { 'Location' => urito_s, 'Content-Type' => 'text/html', 'Content-Length' => bodylengthto_s } [ status, headers, [body] ] end end
228 The Format Segment
Let s revisit the old default route again:
match ':controller(/:action(/:id(:format)))'
The :format at the end matches a literal dot and a "format" segment key after the id field That means it will match, for example, a URL like:
http://localhost:3000/products/show/3xml
Here, params[:format] will be set to xml The :format field is special; it has an effect inside the controller action That effect is related to a method called respond_to The respond_to method allows you to write your action so that it will return different results, depending on the requested format Here s a show action for the products controller that offers either HTML or XML:
def show @product = Productfind(params[:id]) respond_to do |format| formathtml formatxml { render :xml => @productto_xml } end end
The respond_to block in this example has two clauses The HTML clause just consists of formathtml A request for HTML will be handled by the usual rendering of a view template The XML clause includes a code block; if XML is requested, the block will be executed and the result of its execution will be returned to the client
22 The routesrb File
Here s a command-line illustration, using wget (slightly edited to reduce line noise):
$ wget http://localhost:3000/products/show/3xml -O Resolving localhost 127001, ::1 Connecting to localhost|127001|:3000 connected HTTP request sent, awaiting response 200 OK Length: 295 [application/xml] <item> <created-at type="datetime">2007-02-16T04:33:00-05:00</created-at> <description>Keyboard</description> <id type="integer">3</id> <maker>Apple</maker> <modified-at type="datetime"></modified-at> </item>
Routes
The xml on the end of the URL results in respond_to choosing the xml branch, and the returned document is an XML representation of the product Requesting a format that is not included as an option in the respond_to block will not generate an exception Rails will return a 406 Not Acceptable status, to indicate that it can t handle the request If you want to setup an else condition for your repond_to block, you can use the any method, which tells Rails to catch any other formats not explicitly defined
def show @product = Productfind(params[:id]) respond_to do |format| formathtml formatxml { render :xml => @productto_xml } formatany end end
Just make sure that you explicitly tell any what to do with the request or have view templates corresponding to the formats you expect Otherwise, you ll get a MissingTemplate exception
ActionView::MissingTemplate (Missing template clients/index with {:handlers=>[:rhtml, :haml, :rxml, :erb, :builder, :rjs], :locale=>[:en], :formats=>[:json]}