Merge branch 'issue-207' into 'master'

fix: protecting tcp connect phase against low-level syscall errors

Closes #207

See merge request honeyryderchuck/httpx!220

lib/httpx/connection.rb

@@ -512,9 +512,14 @@ module HTTPX
 
     def transition(nextstate)
       handle_transition(nextstate)
-    rescue Errno::ECONNREFUSED,
+    rescue Errno::ECONNABORTED,
+           Errno::ECONNREFUSED,
+           Errno::ECONNRESET,
            Errno::EADDRNOTAVAIL,
            Errno::EHOSTUNREACH,
+           Errno::EINVAL,
+           Errno::ENETUNREACH,
+           Errno::EPIPE,
            TLSError => e
       # connect errors, exit gracefully
       handle_error(e)

lib/httpx/plugins/circuit_breaker/circuit.rb

@@ -28,7 +28,7 @@ module HTTPX
           nil
         when :half_open
           # return nothing or smth based on ratio
-          return if Random::DEFAULT.rand >= @circuit_breaker_half_open_drip_rate
+          return if Random.rand >= @circuit_breaker_half_open_drip_rate
 
           @response
         when :open