I would expect NGINX to be doing some level of caching based on the ETag,
but I would also expect it to be using the Content-Type as part of the
cache validation, which is controlled by the Vary header.

Here's a reasonable looking article (I only skimmed) on it that might give
you enough background to know whether that is a factor:
https://www.fastly.com/blog/best-practices-for-using-the-vary-header that

~Ryan

On Mon, 22 Jun 2015 at 07:22 Ecas Saeculum <ecas....@gmail.com> wrote:

> Reaching the end of my rope, so I thought I'd check here to see if anyone
> has experienced anything similar.
>
> Simple HTTP Server, that responds on connection with a write head and
> response.end('hello'); Simple, simple.
>
> When I do this:
>
> response.writeHead(200, {
>   'Content-Type': 'text/plain',
>   'ETag': 'someETagHash',
>   'Content-Size': '10'
> });
>
>
>
> web page header has Content-Type and Content-Size.
>
> When I remove Content-Type:
>
> response.writeHead(200, {
>   'ETag': 'someETagHash',
>   'Content-Size': '10'
> });
>
>
> Web page receives the ETag.
>
> I'm using nginx as reverse proxy, and nginx is sending no headers to the
> client. Node.js 0.10, no other packages.
>
> Just checking to see if anyone else has seen something similar. I have
> almost 20 hours into troubleshooting this and I'm probably just going to
> run without a Content-Type, if no one has seen something like this. I've
> tried escaping and quoting each/all entries every way I can think of. I've
> cleared out my nginx config to bare bones. I'm not seeing any ill effects
> without a Content-Type, but it is kind of an annoying issue.
>
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