haproxytechblog/blog20200925-01.html

## blog20200925-01.html
HTTP/1.1 404 Not Found
Cache-Control: no-cache
Connection: close
Content-Type: text/html

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8" />
        <title>404 Not Found</title>
    </head>
    <body>
        <main>
            <h1>404 Not Found</h1>

            This is my custom 404 Not Found page!
        </main>
    </body>
</html>

## blog20200925-02.cfg
http-errors myerrors
    errorfile 404 /etc/haproxy/errors/404.http

## blog20200925-03.cfg
http-errors myerrors
    errorfile 400 /etc/haproxy/errors/400.http
    errorfile 401 /etc/haproxy/errors/401.http
    errorfile 403 /etc/haproxy/errors/403.http
    errorfile 404 /etc/haproxy/errors/404.http

## blog20200925-04.cfg
http-errors myerrors
    errorfile 404 /etc/haproxy/errors/404.http

frontend site1
    bind :80
    default_backend webservers
    errorfiles myerrors
    http-response return status 404 default-errorfiles if { status 404 }

## blog20200925-05.cfg
http-errors site1
    errorfile 404 /etc/haproxy/errors/site1-404.http

http-errors site2
    errorfile 404 /etc/haproxy/errors/site2-404.http

frontend allsites
    bind :80
    default_backend site1-servers
    use_backend site2-servers if { req.hdr(host) site2.com }

    # Store host header in variable
    http-request set-var(txn.host) req.hdr(host)

    # Use site1 error page if site1.com
    http-response return status 404 errorfiles site1 if { status 404 } { var(txn.host) -m str site1.com }

    # Use site2 error page if site2.com
    http-response return status 404 errorfiles site2 if { status 404 } { var(txn.host) -m str site2.com }

## blog20200925-06.cfg
frontend site1
    bind :80
    default_backend webservers
    errorfiles myerrors

    unique-id-format %{+X}o\ %ci:%cp_%fi:%fp_%Ts_%rt:%pid
    unique-id-header X-Unique-ID
    log-format "%ci:%cp [%tr] %ft %b/%s %TR/%Tw/%Tc/%Tr/%Ta %ST %B %CC %CS %tsc %ac/%fc/%bc/%sc/%rc %sq/%bq %hr %hs %{+Q}r %[unique-id]"

    http-response return status 404   content-type "text/html; charset=utf-8"   lf-file /etc/haproxy/errors/404.html if { status 404 }

## blog20200925-07.html
<!DOCTYPE html>
<html lang="en">
   <head>
       <meta charset="utf-8" />
       <title>404 Not Found</title>
   </head>
   <body>
       <main>
           <h1>404 Not Found</h1>

           <p>This is my custom 404 Not Found page!</p>

           <p>Unique ID: %[unique-id]</p>
       </main>
   </body>
</html>

## blog20200925-08.json
HTTP/1.1 503 Service Unavailable
Cache-Control: no-cache
Connection: close
Content-Type: application/json

{ "errors" : [ { "status" : "503", "title" : "Service unavailable", "detail" : "No server is available to handle this request." } ] }

## blog20200925-09.cfg
http-errors json
    errorfile 404 /etc/haproxy/errors/404-json.http
    errorfile 503 /etc/haproxy/errors/503-json.http

frontend api
    bind :8080
    default_backend apiservers
    errorfiles json
    http-response return status 404 default-errorfiles if { status 404 }

## blog20200925-10.html
<!DOCTYPE html>
<html lang="en">
<head>
   <meta charset="utf-8" />
   <title>Site Undergoing Maintenance</title>
</head>
<body>
   The site is undergoing scheduled maintenance.
</body>
</html>

## blog20200925-11.cfg
frontend site1
    bind :80
    default_backend webservers
    http-request return  status 200  content-type text/html  file /etc/haproxy/errors/maintenance.html
	HTTP/1.1 404 Not Found
	Cache-Control: no-cache
	Connection: close
	Content-Type: text/html

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="utf-8" />
	<title>404 Not Found</title>
	</head>
	<body>
	<main>
	<h1>404 Not Found</h1>

	This is my custom 404 Not Found page!
	</main>
	</body>
	</html>
	http-errors myerrors
	errorfile 404 /etc/haproxy/errors/404.http
	http-errors myerrors
	errorfile 400 /etc/haproxy/errors/400.http
	errorfile 401 /etc/haproxy/errors/401.http
	errorfile 403 /etc/haproxy/errors/403.http
	errorfile 404 /etc/haproxy/errors/404.http
	http-errors myerrors
	errorfile 404 /etc/haproxy/errors/404.http

	frontend site1
	bind :80
	default_backend webservers
	errorfiles myerrors
	http-response return status 404 default-errorfiles if { status 404 }
	http-errors site1
	errorfile 404 /etc/haproxy/errors/site1-404.http

	http-errors site2
	errorfile 404 /etc/haproxy/errors/site2-404.http

	frontend allsites
	bind :80
	default_backend site1-servers
	use_backend site2-servers if { req.hdr(host) site2.com }

	# Store host header in variable
	http-request set-var(txn.host) req.hdr(host)

	# Use site1 error page if site1.com
	http-response return status 404 errorfiles site1 if { status 404 } { var(txn.host) -m str site1.com }

	# Use site2 error page if site2.com
	http-response return status 404 errorfiles site2 if { status 404 } { var(txn.host) -m str site2.com }
	HTTP/1.1 503 Service Unavailable
	Cache-Control: no-cache
	Connection: close
	Content-Type: application/json

	{ "errors" : [ { "status" : "503", "title" : "Service unavailable", "detail" : "No server is available to handle this request." } ] }
	http-errors json
	errorfile 404 /etc/haproxy/errors/404-json.http
	errorfile 503 /etc/haproxy/errors/503-json.http

	frontend api
	bind :8080
	default_backend apiservers
	errorfiles json
	http-response return status 404 default-errorfiles if { status 404 }