FastCGI cache file has too long header

Palvelin Postmaster via nginx Thu, 13 Dec 2018 01:18:06 -0800

Hi,

I run nginx/1.14.0 (Ubuntu 18.04) and PHP-FPM 7.2. I get such occasional 
(daily) errors about too long cache file headers:


2018/12/13 10:39:49 [crit] 1537#1537: *760972 cache file 
"/var/lib/nginx/fastcgi/mydomain-fi/d/be/7a11ac32c28dc9f8c3d7da12fe3d6bed" has 
too long header, client: XXX.XXX.XXX.XXX, server: mydomain.fi, request: "GET 
/kotitreeni/ HTTP/1.1", host: ”mydomain.fi"

Can someone offer any insight as to why this is happening, what I could do to 
prevent it or how I could further analyze the cause?

Here are a couple examples of headers from such cache files _after_ the error 
log entry (possibly redundant, but anyhow):

Â(\√\’\¶áx≥""a652b989092efd137f04e13cad4af4b3"Accept-Encoding˜,
  ñ#Õ∫3`˝„u»˝Zt
KEY: httpsGETmydomain.fi/kotitreeni/
3Content-Type:  text/html; charset=UTF-8
Last-Modified: Thu, 13 Dec 2018 08:39:31 GMT
Expires: Thu, 13 Dec 2018 09:39:31 GMT
Pragma: public
Cache-Control: max-age=3582, public
ETag: "a652b989092efd137f04e13cad4af4b3"
X-Powered-By: W3 Total Cache/0.9.7
Content-Encoding: gzip
Vary: Accept-Encoding


{\˚\k
\\‘†ÖsÆ""4fca3f56d337d2057ce73a6dd5712d80"Accept-EncodingûíL∏±ÀÕ·p
  ÙÎ(,f
KEY: httpsGETmydomain.fi/ruoka/
3Content-Type:  text/html; charset=UTF-8
Last-Modified: Thu, 13 Dec 2018 07:02:19 GMT
Expires: Thu, 13 Dec 2018 08:02:19 GMT
Pragma: public
Cache-Control: max-age=1696, public
ETag: "4fca3f56d337d2057ce73a6dd5712d80"
X-Powered-By: W3 Total Cache/0.9.7
Content-Encoding: gzip
Vary: Accept-Encoding

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FastCGI cache file has too long header

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