search posts using google blogger's own "try it now" returns "500 Internal Server Error"

i think it began at the beginning of this week that my searches on blogger 
no longer work. i make my requests using api 3.0. i check my query again 
and again and it looks fine ( 
https://www.googleapis.com/blogger/v3/blogs/9219786670952315116/posts/search?q=hello&key=AIzaSyBLTZgkrV31puure6uG0Y5pbKTobwpemuE ) 
. anyway, the same query was working before. so just now i read the 
documentation again to see if my query is indeed wrong. While i was there i 
gave "try it now" a go just to make sure something was indeed wrong with my 
query. I put blogId and q inside the boxes (the required ones) and google 
returns 500 Internal Server Error
- Show headers -
 
{
 "error": {
  "code": 500,
  "message": null
 }
}

so i guess may be something is wrong at blogger's end?

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