diff --git a/fileserver/utils/http.go b/fileserver/utils/http.go
index b1fe79c1..008d8678 100644
--- a/fileserver/utils/http.go
+++ b/fileserver/utils/http.go
@@ -6,10 +6,9 @@ import (
 	"io"
 	"net/http"
 	"strings"
+	"time"
 )
 
-var HttpReqContext, HttpReqCancel = context.WithCancel(context.Background())
-
 func GetAuthorizationToken(h http.Header) string {
 	auth := h.Get("Authorization")
 	splitResult := strings.Split(auth, " ")
@@ -20,7 +19,10 @@ func GetAuthorizationToken(h http.Header) string {
 }
 
 func HttpCommon(method, url string, header map[string][]string, reader io.Reader) (int, []byte, error) {
-	req, err := http.NewRequestWithContext(HttpReqContext, method, url, reader)
+	header["Content-Type"] = []string{"application/json"}
+	ctx, cancel := context.WithTimeout(context.Background(), 45*time.Second)
+	defer cancel()
+	req, err := http.NewRequestWithContext(ctx, method, url, reader)
 	if err != nil {
 		return -1, nil, err
 	}
diff --git a/server/http-tx-mgr.c b/server/http-tx-mgr.c
index 7cc6350a..e2de9a4a 100644
--- a/server/http-tx-mgr.c
+++ b/server/http-tx-mgr.c
@@ -365,7 +365,7 @@ http_post (Connection *conn, const char *url, const char *token,
 
     curl = conn->curl;
 
-    headers = curl_slist_append (headers, "User-Agent: Seafile/"SEAFILE_CLIENT_VERSION" ("USER_AGENT_OS")");
+    headers = curl_slist_append (headers, "User-Agent: Seafile Server/"SEAFILE_CLIENT_VERSION" ("USER_AGENT_OS")");
 
     if (token) {
         token_header = g_strdup_printf ("Authorization: Token %s", token);
@@ -506,7 +506,7 @@ http_tx_manager_get_nickname (const char *modifier)
     json_decref (content);
 
     curl = conn->curl;
-    headers = curl_slist_append (headers, "User-Agent: Seafile/"SEAFILE_CLIENT_VERSION" ("USER_AGENT_OS")");
+    headers = curl_slist_append (headers, "User-Agent: Seafile Server/"SEAFILE_CLIENT_VERSION" ("USER_AGENT_OS")");
     token_header = g_strdup_printf ("Authorization: Token %s", jwt_token);
     headers = curl_slist_append (headers, token_header);
     headers = curl_slist_append (headers, "Content-Type: application/json");
@@ -608,16 +608,16 @@ http_tx_manager_query_share_link_info (const char *token, const char *cookie, co
     }
 
     curl = conn->curl;
-    headers = curl_slist_append (headers, "User-Agent: Seafile/"SEAFILE_CLIENT_VERSION" ("USER_AGENT_OS")");
+    headers = curl_slist_append (headers, "User-Agent: Seafile Server/"SEAFILE_CLIENT_VERSION" ("USER_AGENT_OS")");
     token_header = g_strdup_printf ("Authorization: Token %s", jwt_token);
+    headers = curl_slist_append (headers, token_header);
+    g_free (token_header);
     if (cookie) {
         cookie_header = g_strdup_printf ("Cookie: %s", cookie);
         headers = curl_slist_append (headers, cookie_header);
         g_free (cookie_header);
     }
-    headers = curl_slist_append (headers, token_header);
     headers = curl_slist_append (headers, "Content-Type: application/json");
-    g_free (token_header);
     curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
 
     url = g_strdup_printf("%s/check-share-link-access/?token=%s&type=%s", seaf->seahub_url, token, type);