Bug #4191

Saxon-JS error on null Content-Type

Added by David Cramer 11 months ago. Updated about 2 months ago.

Start date:
Due date:
% Done:


Applies to JS Branch:
1.0, Trunk
Fix Committed on JS Branch:
1.0, Trunk
Fixed in JS Release:
SEF Generated with:
Contact person:
Additional contact persons:


In my UI, I poll the server and refresh content on the page that's changed. I added support for the etag[1] header and ran across a Saxon-JS bug. When I sent an If-None-Match header and the resource is unchanged, the server sends back a "304 Not Modified" and no Content-Type, causing the line in Saxon-JS "var typeParts = respContentType.split(/;/);" to fail with "TypeError: null is not an object (evaluating 'respContentType.split')". I wrapped it in a try/catch as a workaround. Note I had already modified "var part2" to avoid a different error:


dcramer@anatine ~/git-repos/spec-service (updateTitleAndAuthorAuthorUI *)
$ git diff api/app/src/main/webapp/author/resources/Saxon-JS/SaxonJS.js
diff --git a/api/app/src/main/webapp/author/resources/Saxon-JS/SaxonJS.js b/api/app/src/main/webapp/author/resources/Saxon-JS/SaxonJS.js
index f540b4b..f567d87 100644
--- a/api/app/src/main/webapp/author/resources/Saxon-JS/SaxonJS.js
+++ b/api/app/src/main/webapp/author/resources/Saxon-JS/SaxonJS.js
@@ -368,8 +368,13 @@ var BrowserPlatform = (function () {
                 if (!request["status-only"]) {
                     var respContentType = http.getResponseHeader('Content-Type');
                     // get part of string before ';'
-                    var typeParts = respContentType.split(/;/);
-                    var mediaType = typeParts[0];
+                    // DWC: Adding Try/Catch in case there's no ; in the respConentType
+                    try{
+                        var typeParts = respContentType.split(/;/);
+                        var mediaType = typeParts[0];
+                        } catch(e) {
+                            var mediaType = respContentType;
+                        }
                     var part2 = ''; //typeParts[1].trim(); // will this work if 'Content-Type' string only contains media type?
                     // part2 may be 'boundary=...' (if multipart), or encoding 'charset=...'
                     // TODO use part2


#1 Updated by Michael Kay 11 months ago

  • Assignee set to Debbie Lockett
  • Priority changed from Low to Normal

#2 Updated by Debbie Lockett 10 months ago

Thanks for reporting this. It has been added to the list of things to fix in makeHttpRequest!

#3 Updated by Debbie Lockett about 2 months ago

  • Status changed from New to In Progress
  • Applies to JS Branch 1.0, Trunk added

Repro: supply status code 304 in httpStatusTest.

#4 Updated by Debbie Lockett about 2 months ago

  • Status changed from In Progress to Resolved
  • Fix Committed on JS Branch 1.0, Trunk added

Fix committed: let respContentType default to an empty string if the response Content-Type is null, i.e.:

var respContentType = http.getResponseHeader('Content-Type') || '';

Committed on Saxon-JS 1.x and 2 branches.

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