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< a href = "https://github.com/kubernetes/ingress-nginx/edit/master/docs/examples/customization/custom-errors/README.md" title = "Edit this page" class = "md-icon md-content__icon" >  < / a >
< h1 id = "custom-errors" > Custom Errors< a class = "headerlink" href = "#custom-errors" title = "Permanent link" > ¶ < / a > < / h1 >
< p > This example shows how is possible to use a custom backend to render custom error pages. The code of this example is located here < a href = "https://github.com/kubernetes/ingress-nginx/tree/master/docs/examples/customization/custom-errors" > custom-error-pages< / a > < / p >
< p > The idea is to use the headers < code class = "codehilite" > X-Code< / code > and < code class = "codehilite" > X-Format< / code > that NGINX pass to the backend in case of an error to find out the best existent representation of the response to be returned. i.e. if the request contains an < code class = "codehilite" > Accept< / code > header of type < code class = "codehilite" > json< / code > the error should be in that format and not in < code class = "codehilite" > html< / code > (the default in NGINX).< / p >
< p > First create the custom backend to use in the Ingress controller< / p >
< div class = "codehilite" > < pre > < span > < / span > $ kubectl create -f custom-default-backend.yaml
service < span class = "s2" > " nginx-errors" < / span > created
replicationcontroller < span class = "s2" > " nginx-errors" < / span > created
< / pre > < / div >
< div class = "codehilite" > < pre > < span > < / span > $ kubectl get svc
NAME CLUSTER-IP EXTERNAL-IP PORT< span class = "o" > (< / span > S< span class = "o" > )< / span > AGE
echoheaders < span class = "m" > 10< / span > .3.0.7 nodes < span class = "m" > 80< / span > /TCP 23d
kubernetes < span class = "m" > 10< / span > .3.0.1 < none> < span class = "m" > 443< / span > /TCP 34d
nginx-errors < span class = "m" > 10< / span > .3.0.102 < none> < span class = "m" > 80< / span > /TCP 11s
< / pre > < / div >
< div class = "codehilite" > < pre > < span > < / span > $ kubectl get rc
CONTROLLER REPLICAS AGE
echoheaders < span class = "m" > 1< / span > 19d
nginx-errors < span class = "m" > 1< / span > 19s
< / pre > < / div >
< p > Next create the Ingress controller executing< / p >
< div class = "codehilite" > < pre > < span > < / span > $ kubectl create -f rc-custom-errors.yaml
< / pre > < / div >
< p > Now to check if this is working we use curl:< / p >
< div class = "codehilite" > < pre > < span > < / span > $ curl -v http://172.17.4.99/
* Trying 172.17.4.99...
* Connected to 172.17.4.99 (172.17.4.99) port 80 (#0)
> GET / HTTP/1.1
> Host: 172.17.4.99
> User-Agent: curl/7.43.0
> Accept: */*
>
< span class = "nt" > < HTTP< / span > < span class = "err" > /1.1< / span > < span class = "err" > 404< / span > < span class = "err" > Not< / span > < span class = "err" > Found< / span >
< span class = "err" > < < / span > < span class = "err" > Server:< / span > < span class = "err" > nginx/1.10.0< / span >
< span class = "err" > < < / span > < span class = "err" > Date:< / span > < span class = "err" > Wed,< / span > < span class = "err" > 04< / span > < span class = "err" > May< / span > < span class = "err" > 2016< / span > < span class = "err" > 02:53:45< / span > < span class = "err" > GMT< / span >
< span class = "err" > < < / span > < span class = "err" > Content-Type:< / span > < span class = "err" > text/html< / span >
< span class = "err" > < < / span > < span class = "err" > Transfer-Encoding:< / span > < span class = "err" > chunked< / span >
< span class = "err" > < < / span > < span class = "err" > Connection:< / span > < span class = "err" > keep-alive< / span >
< span class = "err" > < < / span > < span class = "err" > Vary:< / span > < span class = "err" > Accept-Encoding< / span >
< span class = "err" > < < / span >
< span class = "err" > < span< / span > < span class = "nt" > > < / span > The page you' re looking for could not be found.< span class = "nt" > < /span> < / span >
* Connection #0 to host 172.17.4.99 left intact
< / pre > < / div >
< p > Specifying json as expected format:< / p >
< div class = "codehilite" > < pre > < span > < / span > $ curl -v http://172.17.4.99/ -H < span class = "s1" > ' Accept: application/json' < / span >
* Trying < span class = "m" > 172< / span > .17.4.99...
* Connected to < span class = "m" > 172< / span > .17.4.99 < span class = "o" > (< / span > < span class = "m" > 172< / span > .17.4.99< span class = "o" > )< / span > port < span class = "m" > 80< / span > < span class = "o" > (< / span > < span class = "c1" > #0)< / span >
> GET / HTTP/1.1
> Host: < span class = "m" > 172< / span > .17.4.99
> User-Agent: curl/7.43.0
> Accept: application/json
>
< HTTP/1.1 < span class = "m" > 404< / span > Not Found
< Server: nginx/1.10.0
< Date: Wed, < span class = "m" > 04< / span > May < span class = "m" > 2016< / span > < span class = "m" > 02< / span > :54:00 GMT
< Content-Type: text/html
< Transfer-Encoding: chunked
< Connection: keep-alive
< Vary: Accept-Encoding
<
< span class = "o" > {< / span > < span class = "s2" > " message" < / span > : < span class = "s2" > " The page you' re looking for could not be found" < / span > < span class = "o" > }< / span >
* Connection < span class = "c1" > #0 to host 172.17.4.99 left intact< / span >
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