parse the endpoint into a URL up front, and gather the proxy from the env up front so that typos and malformed urls will surface immediately

Author: peterguy

cmd/src/main.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"flag"
+	"fmt"
 	"io"
 	"log"
 	"net"
@@ -185,7 +186,8 @@ func (c *config) apiClient(flags *api.Flags, out io.Writer) api.Client {
 	return api.NewClient(opts)
 }
 
-// readConfig reads the config file from the given path.
+// readConfig reads the config from the standard config file, the (deprecated) user-specified config file,
+// the environment variables, and the (deprecated) command-line flags.
 func readConfig() (*config, error) {
 	cfgFile := *configPath
 	userSpecified := *configPath != ""
@@ -298,7 +300,7 @@ func readConfig() (*config, error) {
 				return nil, errors.Newf("invalid proxy configuration: %w", err)
 			}
 			if !isValidUDS {
-				return nil, errors.Newf("invalid proxy socket: %s", path)
+				return nil, errors.Newf("Invalid proxy socket: %s", path)
 			}
 			cfg.proxyPath = path
 		} else {