Question

I have a REST API that returns json responses. Sometimes (and what seems to be at completely random), the json response gets cut off half-way through. So the returned json string looks like:

...route_short_name":"135","route_long_name":"Secte // end of response

I’m pretty sure it’s not an encoding issue because the cut off point keeps changing position, depending on the json string that’s returned. I haven’t found a particular response size either for which the cut off happens (I’ve seen 65kb not get cut off, whereas 40kbs would).

Looking at the response header when the cut off does happen:

{
    "Cache-Control" = "must-revalidate, private, max-age=0";
    Connection = "keep-alive";
    "Content-Type" = "application/json; charset=utf-8";
    Date = "Fri, 11 May 2012 19:58:36 GMT";
    Etag = "\"f36e55529c131f9c043b01e965e5f291\"";
    Server = "nginx/1.0.14";
    "Transfer-Encoding" = Identity;
    "X-Rack-Cache" = miss;
    "X-Runtime" = "0.739158";
    "X-UA-Compatible" = "IE=Edge,chrome=1";
}

Doesn’t ring a bell either. Anyone?

Answer 1

I had the same problem:

Nginx cut off some responses from the FastCGI backend. For example, I couldn’t generate a proper SQL backup from PhpMyAdmin. I checked the logs and found this:

2012/10/15 02:28:14 [crit] 16443#0: *14534527 open()
“/usr/local/nginx/fastcgi_temp/4/81/0000004814” failed (13: Permission
denied) while reading upstream, client: *, server: , request:
“POST / HTTP/1.1″, upstream: “fastcgi://127.0.0.1:9000”, host:
““, referrer: “http://*/server_export.php?token=**“

All I had to do to fix it was to give proper permissions to the /usr/local/nginx/fastcgi_temp folder, as well as client_body_temp.

Fixed!

Thanks a lot samvermette, your Question & Answer put me on the right track.