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Andy
Asked: 2019-07-27 00:09:37 +0800 CST

Nginx multiple Link headers in same request

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In Apache if I make a request that contains multiple Link headers, it will merge them into one comma separated list.

In nginx, if I make the same request all but the last are discarded

For example, with the following request:

PUT https://example.org HTTP/1.1
Link: </some/path>; rel="parent"
Link: </another/path>; rel="child"

Using Apache, the PHP $_SERVER['HTTP_LINK'] variable will contain the following:

</some/path>; rel="parent", </another/path>; rel="child"

However in nginx, the variable will be:

</another/path>; rel="child"

Is there a feature toggle in nginx config I can turn on to mimic Apache's behaviour?

UPDATE:

I should add that I am using PHP-FPM as a fastcgi_pass. I added the following to the nginx config which passes the first Link header instead of the last:

fastcgi_param HTTP_LINK $http_link;

I wonder if there's any way to access $http_link as an array and split it myself in the config file.

nginx

1 Answers

  1. It looks like this is a known bug in nginx: https://trac.nginx.org/nginx/ticket/1316 and https://trac.nginx.org/nginx/ticket/1762

    The original ticket is over two years old now which is disappointing as it doesn't seem to be a priority for the devs.

    The only solution I can think of for now is to parse the Link headers at the client end and combine them into one before the request is made.

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