diff --git a/server/go/blobserver/camlistored.go b/server/go/blobserver/camlistored.go
index e94ecaf02..ab032e6cd 100644
--- a/server/go/blobserver/camlistored.go
+++ b/server/go/blobserver/camlistored.go
@@ -10,6 +10,7 @@ import (
 	"flag"
 	"fmt"
 	"http"
+	"log"
 	"os"
 )
 
@@ -83,7 +84,7 @@ func main() {
 	mux.HandleFunc("/camli/", handleCamli)
 	mux.Handle("/js/", http.FileServer("../../clients/js", "/js/"))
 
-	fmt.Printf("Starting to listen on http://%v/\n", *listen)
+	log.Printf("Starting to listen on http://%v/\n", *listen)
 	err := http.ListenAndServe(*listen, mux)
 	if err != nil {
 		fmt.Fprintf(os.Stderr,
diff --git a/server/go/blobserver/enumerate.go b/server/go/blobserver/enumerate.go
index 9904b756f..4043312e4 100644
--- a/server/go/blobserver/enumerate.go
+++ b/server/go/blobserver/enumerate.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"http"
 	"os"
+	"log"
 	"sort"
 	"strconv"
 	"strings"
@@ -21,14 +22,14 @@ func readBlobs(ch chan *blobInfo, blobPrefix, diskRoot, after string, remain *ui
 	dirFullPath := *flagStorageRoot + "/" + diskRoot
 	dir, err := os.Open(dirFullPath, os.O_RDONLY, 0)
 	if err != nil {
-		fmt.Println("Error opening directory: ", err)
+		log.Println("Error opening directory: ", err)
 		ch <- &blobInfo{Error: err}
 		return
 	}
 	defer dir.Close()
 	names, err := dir.Readdirnames(32768)
 	if err != nil {
-		fmt.Println("Error reading dirnames: ", err)
+		log.Println("Error reading dirnames: ", err)
 		ch <- &blobInfo{Error: err}
 		return
 	}
diff --git a/server/go/blobserver/upload.go b/server/go/blobserver/upload.go
index de2fe3214..9c467da5f 100644
--- a/server/go/blobserver/upload.go
+++ b/server/go/blobserver/upload.go
@@ -6,6 +6,7 @@ import (
 	"http"
 	"io"
 	"io/ioutil"
+	"log"
 	"os"
 	)
 
@@ -32,37 +33,43 @@ func handleMultiPartUpload(conn http.ResponseWriter, req *http.Request) {
 	for {
 		part, err := multipart.NextPart()
 		if err != nil {
-			fmt.Println("Error reading multipart section:", err)
+			log.Println("Error reading multipart section:", err)
 			break
 		}
 		if part == nil {
 			break
 		}
 		formName := part.FormName()
-		fmt.Printf("New value [%s], part=%v\n", formName, part)
+		log.Printf("New value [%s], part=%v\n", formName, part)
 
 		ref := ParseBlobRef(formName)
 		if ref == nil {
-			fmt.Printf("Ignoring form key [%s]\n", formName)
+			log.Printf("Ignoring form key [%s]\n", formName)
 			continue
 		}
 
 		blobGot, err := receiveBlob(ref, part)
 		if err != nil {
-			fmt.Printf("Error receiving blob %v: %v\n", ref, err)
+			log.Printf("Error receiving blob %v: %v\n", ref, err)
 			break
 		}
-		fmt.Printf("Received blob %v\n", blobGot)
+		log.Printf("Received blob %v\n", blobGot)
 		receivedBlobs = append(receivedBlobs, blobGot)
 	}
 
-	fmt.Println("Done reading multipart body.")
-	for _, got := range receivedBlobs {
-		fmt.Printf("Got blob: %v\n", got)
-	}
-	// TODO: put the blobs in the JSON here
-
+	log.Println("Done reading multipart body.")
 	ret := commonUploadResponse(req)
+
+	received := make([]map[string]interface{}, 0)
+	for _, got := range receivedBlobs {
+		log.Printf("Got blob: %v\n", got)
+		blob := make(map[string]interface{})
+		blob["blobRef"] = got.blobRef.String()
+		blob["size"] = got.size
+		received = append(received, blob)
+	}
+	ret["received"] = received
+
 	http_util.ReturnJson(conn, ret)
 }
 
@@ -96,7 +103,7 @@ func receiveBlob(blobRef *BlobRef, source io.Reader) (blobGot *receivedBlob, err
 	success := false // set true later
 	defer func() {
 		if !success {
-			fmt.Println("Removing temp file: ", tempFile.Name())
+			log.Println("Removing temp file: ", tempFile.Name())
 			os.Remove(tempFile.Name())
 		}
 	}()
diff --git a/server/go/http_util/http_util.go b/server/go/http_util/http_util.go
index e87a62433..bd9174b09 100644
--- a/server/go/http_util/http_util.go
+++ b/server/go/http_util/http_util.go
@@ -5,10 +5,12 @@ import (
 	"http"
 	"json"
 	"os"
+	"log"
 )
 
 func BadRequestError(conn http.ResponseWriter, errorMessage string) {
 	conn.WriteHeader(http.StatusBadRequest)
+	log.Printf("Bad request: %s", errorMessage)
 	fmt.Fprintf(conn, "%s\n", errorMessage)
 }
 
@@ -18,6 +20,7 @@ func ServerError(conn http.ResponseWriter, err os.Error) {
 }
 
 func ReturnJson(conn http.ResponseWriter, data interface{}) {
+	conn.SetHeader("Content-Type", "text/javascript")
 	bytes, err := json.MarshalIndent(data, "", "  ")
 	if err != nil {
 		BadRequestError(conn, fmt.Sprintf(
diff --git a/server/go/sigserver/camsigd.go b/server/go/sigserver/camsigd.go
index be09c6c35..7a4daacb8 100644
--- a/server/go/sigserver/camsigd.go
+++ b/server/go/sigserver/camsigd.go
@@ -76,7 +76,7 @@ func main() {
 	mux := http.NewServeMux()
 	mux.HandleFunc("/", handleRoot)
 	mux.HandleFunc("/camli/sig/", handleCamliSig)
-	fmt.Printf("Starting to listen on http://%v/\n", *listen)
+	log.Printf("Starting to listen on http://%v/\n", *listen)
 
 	listener, err := net.Listen("tcp", *listen)
 	if err != nil {