Weird “406 not acceptable” error

Question

When I try to hit this action via Javascript, I get a 406 Not Acceptable error:

  def show
    @annotation = Annotation.find_by_id(params[:id])
         


        

Answer 1

I hit this problem when I forgot to add :remote => true to my Ajax form.

Answer 2

I cracked the case!

I was sending a format parameter with my get request in order to tell the server to send me markdown instead of HTML. Here's my Javascript:

$.get("/annotations/" + annotation_id, {format: 'raw'}, function(data) {
});

and then I was looking for this parameter in the format.js block:

   format.js {
     if params[:format] == "raw"
       render :text => @annotation.body.to_s
     else
       render :text => @annotation.body.to_html
     end
   }

but apparently a format parameter confuses the respond_to block. I changed it from {format: 'raw'} to {markdown: 'true'} and it works.

I guess this is a bug in Rails?

Answer 3

Can you try without setting the Accept Header? It should actually work even without the Accept header.

Answer 4

This happened to me when using HTTPRiot connecting to a JSON rendering web app from an iPhone app. It appears that the issue is due to Rails expecting an Accept HTTP header that it is well, comfortable with. As such, I used Firefox's LiveHTTPHeaders extension to see what headers work without a 406. In any case the Accept string that worked was:

text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Another area that I would examine is the JSON-producing controller. If the controller is missing a format directive to specify it can return JSON in response, that too may cause a 406 error.

Answer 5

If you are using jRails this was causing a lot of problems for me, here is my application.js file:

$(document).ready(function () {
    $.ajaxSetup({
        beforeSend: function (xhr) {
            xhr.setRequestHeader("Accept", "text/javascript, text/html, application/xml, text/xml, */*");
        }
    });
});

Answer 6

i was calling the url for js format but had this in the controller:

respond_to do |format|
  format.html 
end

this worked fine in Safari, but not with Firefox.

naturally i was missing something, should be:

respond_to do |format|
  format.html
  format.js
end

and now both browsers are fine.