Make request from specific interface.

README.md

@@ -312,6 +312,7 @@ For information about options that've changed, there's always [the changelog](ht
  - `headers`     : Object containing custom HTTP headers for request. Overrides defaults described below.
  - `auth`        : Determines what to do with provided username/password. Options are `auto`, `digest` or `basic` (default). `auto` will detect the type of authentication depending on the response headers.
  - `stream_length`: When sending streams, this lets you manually set the Content-Length header --if the stream's bytecount is known beforehand--, preventing ECONNRESET (socket hang up) errors on some servers that misbehave when receiving payloads of unknown size. Set it to `0` and Needle will get and set the stream's length for you, or leave unset for the default behaviour, which is no Content-Length header for stream payloads.
+ - `localAddress`     : <string>, IP address. Passed to http/https request. Local interface from witch the request should be emitted.
 
 Response options
 ----------------

lib/needle.js

@@ -191,7 +191,9 @@ Needle.prototype.setup = function(uri, options) {
   // the basics
 
   var config = {
-    http_opts : {}, // passed later to http.request() directly
+    http_opts : {
+      localAddress: get_option('localAddress', undefined)
+    }, // passed later to http.request() directly
     output    : options.output,
     proxy     : get_option('proxy', defaults.proxy),
     parser    : get_option('parse_response', defaults.parse_response),