Ignore errors trying to update the backport tables. Fixes #788

lib/puma/rack/backports/uri/common_18.rb

@@ -7,6 +7,7 @@
 #
 
 module URI
+  begin
     TBLENCWWWCOMP_ = {} # :nodoc:
     256.times do |i|
       TBLENCWWWCOMP_[i.chr] = '%%%02X' % i
@@ -23,6 +24,8 @@ module URI
     end
     TBLDECWWWCOMP_['+'] = ' '
     TBLDECWWWCOMP_.freeze
+  rescue Exception
+  end
 
   # Encode given +s+ to URL-encoded form data.
   #

lib/puma/rack/backports/uri/common_192.rb

@@ -17,6 +17,7 @@
 require 'uri/common'
 
 module URI
+  begin
     TBLDECWWWCOMP_ = {} unless const_defined?(:TBLDECWWWCOMP_)  #:nodoc:
     if TBLDECWWWCOMP_.empty?
       256.times do |i|
@@ -29,6 +30,8 @@ module URI
       TBLDECWWWCOMP_['+'] = ' '
       TBLDECWWWCOMP_.freeze
     end
+  rescue Exception
+  end
 
   def self.decode_www_form(str, enc=Encoding::UTF_8)
     return [] if str.empty?

lib/puma/rack/backports/uri/common_193.rb

@@ -8,7 +8,9 @@ require 'uri/common'
 # Relevant commit:
 # https://github.com/ruby/ruby/commit/edb7cdf1eabaff78dfa5ffedfbc2e91b29fa9ca1
 
+
 module URI
+  begin
     256.times do |i|
       TBLENCWWWCOMP_[i.chr] = '%%%02X' % i
     end
@@ -24,6 +26,8 @@ module URI
     end
     TBLDECWWWCOMP_['+'] = ' '
     TBLDECWWWCOMP_.freeze
+  rescue Exception
+  end
 end
 
 # :startdoc: