Optionally not creating go routines on HTTP requests: https://groups.google.com/forum/#!topic/golang-nuts/iwCz_pqu8R4

net.http.diff

diff -r ceb13960d05b src/pkg/net/http/server.go
--- a/src/pkg/net/http/server.go	Thu Mar 13 13:25:59 2014 +0400
+++ b/src/pkg/net/http/server.go	Thu Jul 03 21:48:41 2014 +0530
@@ -1615,6 +1615,8 @@
 	ErrorLog *log.Logger
 
 	disableKeepAlives int32 // accessed atomically.
+
+	DisableGoRoutines bool
 }
 
 // A ConnState represents the state of a client connection to a server.
@@ -1700,7 +1702,9 @@
 // new service goroutine for each.  The service goroutines read requests and
 // then call srv.Handler to reply to them.
 func (srv *Server) Serve(l net.Listener) error {
-	defer l.Close()
+	if !srv.DisableGoRoutines {
+		defer l.Close()
+	}
 	var tempDelay time.Duration // how long to sleep on accept failure
 	for {
 		rw, e := l.Accept()
@@ -1726,7 +1730,11 @@
 			continue
 		}
 		c.setState(c.rwc, StateNew) // before Serve can return
-		go c.serve()
+		if srv.DisableGoRoutines {
+			c.serve()
+		} else {
+			go c.serve()
+		}
 	}
 }

test.go

package main

import (
	"fmt"
	"net"
	"net/http"
	"github.com/amitu/gutils"
)

func LimitedListenAndServe(addr string, handler http.Handler, limit int) error {
	listener, err := net.Listen("tcp", addr)
	if err != nil {
		return err
	}

	server := &http.Server{ Handler: handler, DisableGoRoutines: true}

	for i := 0; i < limit; i++ {
		go server.Serve(listener)
	}

	return nil
}

func main() {
	mux := http.NewServeMux()

	mux.HandleFunc("/bar", func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprintf(w, "Hello")
	})

	LimitedListenAndServe(":8899", mux, 1)
	// http.ListenAndServe(":8899", mux)
	gutils.WaitForCtrlC()
}