Broken AJAX? Nothing coming back?

I recently came across a funny bug where I was executing an AJAX method and the response was empty.

I check the server side and I know that my particular query is returning a result, but thanks to Firebug I can see it’s failing in the browser.

So there was something definitely amiss.

In particular, I was returning my result as a JSON object which should have looked like this:

{message: "Order Filled"}

However, Firebug was throwing the following error (within the jQuery library – but I had the same problem when I hadn’t used a library):

syntax error data =

The problem is down to the size of the response. It’s something like apache is compressing it to nothing. Not very technical I realise – but the solution is to pad the response.

I fixed it by placing a ‘\n’ before the JSON – since it’s legal syntax it doesn’t cause a problem, and it means the response is read in the browser.

All was well again in the land of AJAX & Remy.

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