Add before_execution_proc support to Requests.

This makes it possible for individual requests to carry independent
before_execution_procs. (We're slowly getting rid of the messy global
configuration.)

Fixes: #137

history.md

@@ -51,6 +51,9 @@ This release is largely API compatible, but makes several breaking changes.
 - When following HTTP redirection, store a list of each previous response on
   the response object as `.history`. This makes it possible to access the
   original response headers and body before the redirection was followed.
+- Add `:before_execution_proc` option to `RestClient::Request`. This makes it
+  possible to add procs like `RestClient.add_before_execution_proc` to a single
+  request without global state.
 
 # 1.8.0
 

lib/restclient/request.rb

@@ -33,6 +33,9 @@ module RestClient
   # * :ssl_version specifies the SSL version for the underlying Net::HTTP connection
   # * :ssl_ciphers sets SSL ciphers for the connection. See
   #     OpenSSL::SSL::SSLContext#ciphers=
+  # * :before_execution_proc a Proc to call before executing the request. This
+  #      proc, like procs from RestClient.before_execution_procs, will be
+  #      called with the HTTP request and request params.
   class Request
 
     # TODO: rename timeout to read_timeout
@@ -186,6 +189,8 @@ module RestClient
       @max_redirects = args[:max_redirects] || 10
       @processed_headers = make_headers headers
       @args = args
+
+      @before_execution_proc = args[:before_execution_proc]
     end
 
     def execute & block
@@ -479,6 +484,10 @@ module RestClient
         before_proc.call(req, args)
       end
 
+      if @before_execution_proc
+        @before_execution_proc.call(req, args)
+      end
+
       log_request