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Following on from the previous list and on redirect and rewrites engine X provides us with a third somewhat

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unique directive called Tri files try files as with the return and rewrite directives can be used in

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the server context.

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So applying to all incoming requests or inside a location context with trifles allows us to do is have

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engine X check for a resource to respond worth in any number of locations relative to the root directory

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with a final argument that result in a rewrite and re-evaluation.

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As with the rewrite directive.

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This is a directive which being so unique in its behaviour.

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I'd suggest you really try out in a number of ways using a simple test configuration but nonetheless

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will cover some arbitrary examples.

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First off are clear these rewrites from the previous lesson leave the Greek location as we can reuse

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that.

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In this lesson and also get rid of Greet slash John then in the server context.

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So applying to all incoming requests I'll say try files slash thumb Dot be in G first which we know

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exists.

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Followed by slash.

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Great.

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So what this directive is doing then all the time being in the server context is checking whether slash

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sites slash demo slash thumbed or PRNG exists and if it does serve it.

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If however this first argument doesn't exist move on and try the next one and so on.

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In our case some Thumper's PRNG definitely exists relative to the root directory so this should be served

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for all requests.

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Save this and reload the configuration.

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My browser has the demo side loaded at the moment so refresh and sure enough we get thumbed on PRNG.

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Try a u r l that doesn't exist at all.

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I'll say slash something.

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And the same.

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Or style C S S which does exist.

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No change.

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Try files intercept the requests checks if this first argument exists and serves it regardless of the

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request.

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You are I meaning that should we change some doppie energy to a resource that doesn't exist.

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Cat dog B and G drive files won't find it and move on to the next argument slash greet very important

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however when.

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Try files reaches its last argument.

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That argument is treated as an internal rewrite meaning.

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In this case and only in this case will the rewritten request also be re-evaluated and caught by this

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slash Greek location.

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Reload still on Style dotsie says Worth.

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Try files.

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No longer looking for thumb don't be in G reload.

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Hello user.

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That response from the Greek location as trifocals rewrote the request to slash greet and the same for

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the root.

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You are right.

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Typically then the.

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Try files.

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DirecTV is used with engine X variables for example to first check the request as it is we can add as

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the first argument here.

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The variable.

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You are right.

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Meaning before anything else.

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Try the you are I save and reload.

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This time try thumb dot P in G.

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And add loads.

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As it exists on the desk.

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Same for Style dotsie SS.

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And indexed old age to you Mel.

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Now knowing the last argument rewrites and is exactly that the last option this should ideally be something

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that won't ever fail.

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For example I'll create a new location to handle not found requests friendly underscore foro for.

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Which just returns a four of four worth.

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Sorry.

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That file could not be found.

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And use this location as the final argument on the trifocals directive.

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Save and reload.

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Make a request for a resource which doesn't exist for example slash nothing which will cause engine

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X to first look for the you are right as it is relative to the root.

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So slash sites slash demo slash.

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Nothing that doesn't exist.

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Meaning Go check for Slash sites slash demo slash cat.

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Don't be in G also doesn't exist.

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Then try slash greet which whilst we have a location for it still doesn't exist relative to the root

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directory.

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Remember only the very last argument causes a rewrite.

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These first ones only have engine X check relative to the root directory which means the slash nothing

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will finally be rewritten to slash friendly foro for revaluated and caught by the match and location

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resulting in this message and a foro for.

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Enter.

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And sure enough we get that message.

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We can confirm the status code using cool copy that you are real.

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Cool.

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Capital.

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I.

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And that request for a 4.

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Not Found.

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OK good.

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Very last thing I want to show in this lesson is named locations.

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This being a concept which you might run into at some point and name location simply means assigning

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a name to a location context and using a directive such as Try files.

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Use that location by its name ensuring no revaluation has to happen on that final argument but instead

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just a definite call to the name location to name a location then more specifically this friendly underscore

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foro for use an at sign with a name at friendly underscore foro for doing the same on the location in

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order to you name it.

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Reload.

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And the browser.

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We get the same back to some DOD PRNG it's found and served.