URL with long query string

[riccardo.casatta@…]

When I try to open the link which is served by nginx in this gist ​https://gist.github.com/RCasatta/b8a9ec2f1e8e6cc539c25f7b1ac77140
The connection is closed
but it works up to 5849 characters in the query string

from the access.log I have something like this
x.x.x.x - - [07/Nov/2017:09:51:50 +0000] "-" 000 0 "-" "-"
and from the error.log I have nothing

I tried to add to the nginx.conf the lines:

client_header_buffer_size 64k;
large_client_header_buffers 4 64k;

but nothing has changed

[Maxim Dounin]

Most likely the problem is that you are using HTTP/2 and the request hits the ​http2_max_field_size limit. Try checking error log at the "info" level, it should contain something like:

2017/11/08 03:46:35 [info] 68639#100081: *2 client exceeded http2_max_field_size limit while processing HTTP/2 connection, client: ..., server: ...

Adjusting the limit should resolve the issue.

[riccardo.casatta@…]

I confirm the issue was using the wrong parameter.
Using ​http2_max_field_size fix the problem