Add configuration setting to set proxy server

config.ini

@@ -4,4 +4,5 @@ regex = usb|acm|com  # Regular expression to filter serial port list
 v = true  # show debug logging
 appName = CreateBridge
 updateUrl = http://downloads.arduino.cc/
-origins = http://local.arduino.cc:8000
+origins = http://local.arduino.cc:8080
+#httpProxy = http://your.proxy:port # Proxy server for HTTP requests

main.go

@@ -45,12 +45,14 @@ var (
 
 // iniflags
 var (
-	iniConf      = flag.NewFlagSet("ini", flag.ContinueOnError)
 	address      = iniConf.String("address", "127.0.0.1", "The address where to listen. Defaults to localhost")
 	appName      = iniConf.String("appName", "", "")
 	gcType       = iniConf.String("gc", "std", "Type of garbage collection. std = Normal garbage collection allowing system to decide (this has been known to cause a stop the world in the middle of a CNC job which can cause lost responses from the CNC controller and thus stalled jobs. use max instead to solve.), off = let memory grow unbounded (you have to send in the gc command manually to garbage collect or you will run out of RAM eventually), max = Force garbage collection on each recv or send on a serial port (this minimizes stop the world events and thus lost serial responses, but increases CPU usage)")
 	hostname     = iniConf.String("hostname", "unknown-hostname", "Override the hostname we get from the OS")
+	httpProxy    = iniConf.String("httpProxy", "", "Proxy server for HTTP requests")
+	httpsProxy   = iniConf.String("httpsProxy", "", "Proxy server for HTTPS requests")
 	indexURL     = iniConf.String("indexURL", "https://downloads.arduino.cc/packages/package_staging_index.json", "The address from where to download the index json containing the location of upload tools")
+	iniConf      = flag.NewFlagSet("ini", flag.ContinueOnError)
 	logDump      = iniConf.String("log", "off", "off = (default)")
 	origins      = iniConf.String("origins", "", "Allowed origin list for CORS")
 	regExpFilter = iniConf.String("regex", "usb|acm|com", "Regular expression to filter serial port list")
@@ -178,6 +180,32 @@ func main() {
 			debug.SetGCPercent(-1)
 		}
 
+		// If the httpProxy setting is set, use its value to override the
+		// HTTP_PROXY environment variable. Setting this environment
+		// variable ensures that all HTTP requests using net/http use this
+		// proxy server.
+		if *httpProxy != "" {
+			log.Printf("Setting HTTP_PROXY variable to %v", *httpProxy)
+			err := os.Setenv("HTTP_PROXY", *httpProxy)
+			if err != nil {
+				// The os.Setenv documentation doesn't specify how it can
+				// fail, so I don't know how to handle this error
+				// appropriately.
+				panic(err)
+			}
+		}
+
+		if *httpsProxy != "" {
+			log.Printf("Setting HTTPS_PROXY variable to %v", *httpProxy)
+			err := os.Setenv("HTTPS_PROXY", *httpProxy)
+			if err != nil {
+				// The os.Setenv documentation doesn't specify how it can
+				// fail, so I don't know how to handle this error
+				// appropriately.
+				panic(err)
+			}
+		}
+
 		// see if they provided a regex filter
 		if len(*regExpFilter) > 0 {
 			log.Printf("You specified a serial port regular expression filter: %v\n", *regExpFilter)
@@ -474,7 +502,7 @@ func parseIni(filename string) (args []string, err error) {
 			if key == "name" {
 				continue
 			}
-			args = append(args, "-"+key, val)
+			args = append(args, "-"+key+"="+val)
 		}
 	}