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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
def call(env)
env["PATH_INFO"] = env["SCRIPT_NAME"].to_s + env["PATH_INFO"].to_s
env["SCRIPT_NAME"] = ""
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.