1 files changed, 27 insertions, 23 deletions
diff --git a/services/sync/modules/service.js b/services/sync/modules/service.js
index 5c91323b5..32e047f53 100644
--- a/services/sync/modules/service.js
+++ b/services/sync/modules/service.js
@@ -1067,31 +1067,34 @@ Sync11Service.prototype = {
   // Note: returns false if we failed for a reason other than the server not yet
   // supporting the api.
   _fetchServerConfiguration() {
-    // This is similar to _fetchInfo, but with different error handling.
+    if (Svc.Prefs.get("APILevel") >= 2) {
+      // This is similar to _fetchInfo, but with different error handling.
+      // Only supported by later sync implementations.
 
-    let infoURL = this.userBaseURL + "info/configuration";
-    this._log.debug("Fetching server configuration", infoURL);
-    let configResponse;
-    try {
-      configResponse = this.resource(infoURL).get();
-    } catch (ex) {
-      // This is probably a network or similar error.
-      this._log.warn("Failed to fetch info/configuration", ex);
-      this.errorHandler.checkServerError(ex);
-      return false;
-    }
+      let infoURL = this.userBaseURL + "info/configuration";
+      this._log.debug("Fetching server configuration", infoURL);
+      let configResponse;
+      try {
+        configResponse = this.resource(infoURL).get();
+      } catch (ex) {
+        // This is probably a network or similar error.
+        this._log.warn("Failed to fetch info/configuration", ex);
+        this.errorHandler.checkServerError(ex);
+        return false;
+      }
 
-    if (configResponse.status == 404) {
-      // This server doesn't support the URL yet - that's OK.
-      this._log.debug("info/configuration returned 404 - using default upload semantics");
-    } else if (configResponse.status != 200) {
-      this._log.warn(`info/configuration returned ${configResponse.status} - using default configuration`);
-      this.errorHandler.checkServerError(configResponse);
-      return false;
-    } else {
-      this.serverConfiguration = configResponse.obj;
+      if (configResponse.status == 404) {
+        // This server doesn't support the URL yet - that's OK.
+        this._log.debug("info/configuration returned 404 - using default upload semantics");
+      } else if (configResponse.status != 200) {
+        this._log.warn(`info/configuration returned ${configResponse.status} - using default configuration`);
+        this.errorHandler.checkServerError(configResponse);
+        return false;
+      } else {
+        this.serverConfiguration = configResponse.obj;
+      }
+      this._log.trace("info/configuration for this server", this.serverConfiguration);
     }
-    this._log.trace("info/configuration for this server", this.serverConfiguration);
     return true;
   },
 
@@ -1335,9 +1338,10 @@ Sync11Service.prototype = {
       // We successfully synchronized.
       // Check if the identity wants to pre-fetch a migration sentinel from
       // the server.
+      // Only supported by Sync server API level 2+
       // If we have no clusterURL, we are probably doing a node reassignment
       // so don't attempt to get it in that case.
-      if (this.clusterURL) {
+      if (Svc.Prefs.get("APILevel") >= 2 && this.clusterURL) {
         this.identity.prefetchMigrationSentinel(this);
       }