rack

问题 I know a Rack middleware filter is a Ruby class with an initialize and a call method. I know the call method takes an "env" argument. Something like this: class MyFilter def initialize(app) end def call(env) end end My question is: what exactly is the "env" argument sent to "call"? Is this the same as the Rails ENV environment (ie. development, testing, production). Thanks! 回答1: env is just a hash. Rack itself and various middlewares add values into it. To understand what the various keys are

问题 I have an api written in rails which on each request responds with a JSON response. The response could be huge, so i need to compress the JSON response using gzip. Wondering how to do this in rails controller? I have added the line use Rack::Deflater in config.ru Should I also be changing something in the line which renders JSON? render :json => response.to_json() Also, how do i check if the response is in gzip format or not..?? I did a curl request from terminal, I see only the normal plain

问题 I have an api written in rails which on each request responds with a JSON response. The response could be huge, so i need to compress the JSON response using gzip. Wondering how to do this in rails controller? I have added the line use Rack::Deflater in config.ru Should I also be changing something in the line which renders JSON? render :json => response.to_json() Also, how do i check if the response is in gzip format or not..?? I did a curl request from terminal, I see only the normal plain

问题 Let's say I have the simplest single-file Sinatra app. The hello world on their homepage will do. I want to run it under Apache with Phusion Passenger, AKA mod_rails. What directory structure do I need? What do I have to put in the vhost conf file? I understand I need a rackup file. What goes in it and why? 回答1: Basic directory structure: app |-- config.ru # <- rackup file |-- hello-app.rb # <- your application |-- public/ # <- static public files (passenger needs this) `-- tmp/ `-- restart

问题 I am using Sinatra and CORS to accept a file upload on domain A (hefty.burger.com). Domain B (fizzbuzz.com) has a form that uploads a file to a route on A. I have an options route and a post route, both named '/uploader'. options '/uploader' do headers 'Access-Control-Allow-Origin' => 'http://fizz.buzz.com', 'Access-Control-Allow-Methods' => 'POST' 200 end post '/uploader' do ... content_type :json [{:mary => 'little lamb'}].to_json end The options gets hit first... and it works.. then the

问题 The title is pretty self-explanatory. Is there any way to get the headers (except for Rack::Request.env[] )? 回答1: The HTTP headers are available in the Rack environment passed to your app: HTTP_ Variables: Variables corresponding to the client-supplied HTTP request headers (i.e., variables whose names begin with HTTP_). The presence or absence of these variables should correspond with the presence or absence of the appropriate HTTP header in the request. So the HTTP headers are prefixed with

问题 I would like to mount a sinatra application in my rails app. But I would like this one to share the same layout. The iframe could work but do you have any other idea ? Thanks 回答1: You basically need to do two things: You need to tell the Rails router that a certain URL path is to be handled by another Rack app (in your case a Sinata app). This can be done by adding this to your routes.rb: match "/sinatra" => MySinatraApp, :anchor => false Having done that, you can create your app like so:

问题 I have a Rack application that looks like this: class Foo def initialize(app) @app = app end def call(env) env["hello"] = "world" @app.call(env) end end After hooking my Rack application into Rails, how do I get access to env["hello"] from within Rails? Update : Thanks to Gaius for the answer. Rack and Rails let you store things for the duration of the request, or the duration of the session: # in middleware def call(env) Rack::Request.new(env)["foo"] = "bar" # sticks around for one request

问题 I've just started my first Sinatra project, a simple TV-show management web app, and wanted to have beautiful URLs. So when a user types in the search box and submits, I don't want to have a /?search=foobar -style URL and want do redirect them to /search/foobar . This also enables me to separate the get '/search/:name route from the main get '/' route. I've implemented the redirect using a before filter and properly escaped the params[] variable: before do if params.has_key? 'search' redirect

问题 I need to patch Rack with the following patch: http://github.com/rack/rack/commit/dae12e088592ee69545b5f2f81b87f4959859164 What's the best practice for doing this? Should I gem unpack, apply the patch, then repack the gem and ship it with capistrano to make sure my version of the gem gets to the destination server? can I just pop rack into vendor/plugins/ and rely on it being loaded first prior to the system wide gem? I want to take the path of least resistance and easily be able to deploy