Blogger API v3 returns "404 Not Found" for all my requests

Hi,
Suddenly all requests to Blogger API started to return "404 Not Found" for 
all my blogs.
The request performed is "blogger.blogs.getByUrl".

The returned JSON is:

{
  "code" : 404,
  "errors" : [ {
    "domain" : "global",
    "message" : "Not Found",
    "reason" : "notFound"
  } ],
  "message" : "Not Found"
}

Some of the url's are:

http://stallostergotland2013.blogspot.com/
http://stallvasternorrland2013.blogspot.com/
http://stalluppland2013.blogspot.com/
.
.
.

The blogs work fine when using a web-browser, but the API responds with a 
404 Not Found...
The same status-code is returned when using the API Browser at 
https://developers.google.com/apis-explorer/#p/blogger/v3/blogger.blogs.getByUrl

This has broken 2 websites for my clients so a solution to this problem 
would be very, very appreciated.

Best Regards,
Peter

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