On Fri, Jan 10, 2014 at 10:37:50PM +1100, nano wrote:
> On 10/01/2014 8:36 PM, Francis Daly wrote:
> >On Fri, Jan 10, 2014 at 02:07:34PM +1100, nano wrote:
> >>On 10/01/2014 7:58 AM, Francis Daly wrote:

Hi there,

This mail is going to sound a bit negative.

> >>> location ^~ /phpmyadmin/ {
> >>> location ~ \.php$ {
> >
> >At this point, you could instead use "location ~
> >^/phpmyadmin/.*\.php$". It will match exactly the same requests --
> >can you see why?
>
> Is it because "~^ /phpmyadmin/.*\.php$" will be the longest prefix
> string

No.

"^~" is not the same as "~^". "~^ /" is not the same as "~ ^/".

Read everything very slowly and carefully. The order of the various
squiggles matters.

> >Each nginx request is handled in one location.

> But, doesn't "...the location
<snip>
> used" imply that all requests are subject to the entirety of the
> configuration file and not just a specific location block?

No. Read it again.

What way of phrasing it would allow you to understand that one location
is chosen? Perhaps a documentation patch could be provided.

> For example, if one specifies a location, such as /example/.*\.php$ and
> assigns certain directives inside that location block, if there are
> other matching expressions (\.php$) in the configuration file, they
> could supersede any directives contained within the /example block
> simply *because they come before the /example block?*

No.

One location is chosen.

The configuration in any other location is irrelevant for this request.

There is no superseding across locations. There is no merging across
locations. There is only the configuration in, and inherited into,
the one location that matters for this request.

> It is good; repetition makes practice. And this point you reiterate is a
> rule I am struggling to understand but that needs to be understood.

After you accept that one location is chosen, then you can start wondering
about what happens when there are nested locations, or when no locations
match, and what happens when there are (e.g. rewrite module) directives
outside of all locations.

But until you accept that one location is chosen, you're unlikely to be
comfortable making new nginx configurations.

f
--
Francis Daly francis@daoine.org

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