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= Known issues with Rack and ECMA-262 * Many users expect the escape() function defined in ECMA-262 to be compatible with URI. Confusion is especially strong because the documentation for the escape function includes a reference to the URI specifications. ECMA-262 escape is not however a URI escape function, it is a javascript escape function, and is not fully compatible. Most notably, for characters outside of the BMP. Users should use the more correct encodeURI functions. = Known issues with Rack and Web servers * Lighttpd sets wrong SCRIPT_NAME and PATH_INFO if you mount your FastCGI app at "/". This can be fixed by using this middleware: class LighttpdScriptNameFix def initialize(app) @app = app end def call(env) env["PATH_INFO"] = env["SCRIPT_NAME"].to_s + env["PATH_INFO"].to_s env["SCRIPT_NAME"] = "" @app.call(env) end end Of course, use this only when your app runs at "/". Since lighttpd 1.4.23, you also can use the "fix-root-scriptname" flag in fastcgi.server. = Known conflicts regarding parameter parsing * Many users have differing opinions about parameter parsing. The current parameter parsers in Rack are based on a combination of the HTTP and CGI specs, and are intended to round-trip encoding and decoding. There are some choices that may be viewed as deficiencies, specifically: - Rack does not create implicit arrays for multiple instances of a parameter - Rack returns nil when a value is not given - Rack does not support multi-type keys in parameters These issues or choices, will not be fixed before 2.0, if at all. They are very major breaking changes. Users are free to write alternative parameter parsers, and their own Request and Response wrappers. Moreover, users are encouraged to do so.