Website is returning "CSI/tbsd_" and "CSI/_tbnd" errors in browsers

Question

I have a website that is returning some odd warning messages and errors in both Firefox and Chrome.

Firefox returns these errors:

GET http://fonts.googleapis.com/css?family=Varela+Round 200 OK 7c8e43d.js (line 18)
13:27:41.46 CSI/tbsd_
13:27:41.48 CSI/_tbnd

Chrome returns this error:

XMLHttpRequest cannot load http://fonts.googleapis.com/css?family=Varela+Round. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin is therefore not allowed access. 

I'm guessing that this problem is related to Google Fonts API and Access-Control-Allow-Origin How can I fix the errors for this?

Answer 1

The log entries for CSI/tbsd_ and CSI/_tbnd are not errors but time stamps, which are generated by the Google APIs.

Time stamps can be generated in JavaScript using the console.timeStamp() function.

You can also see these time stamp logs on google.com:

Within Firebug they are even displayed as olive lines within the Net panel timeline:

So these log messages are nothing to worry about. They just provide some information for debugging purposes.

Your actual problem related to the error you get in Chrome is caused by a cross-domain request. So the browser is blocking it for security reasons related to the same origin policy. There's a tutorial on "Cross-Origin Resource Sharing" (CORS) at html5rocks.com.

See also related questions on stackoverflow:

• XMLHttpRequest cannot load, No 'Access-Control-Allow-Origin' header is present on the requested resource
• "No 'Access-Control-Allow-Origin' header is present on the requested resource"

Answer 2

I've also spotted this on my site recently, particularly since adding Google DFP (Doubleclick) code to my page.

I found the following description on this site SpanishDict Engineering

csi?tbsd is a console.time call comng from google

That seems to make sense in the context of my web page. I hope it makes similar sense for you?