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To customize a 503 generated by HAProxy, put a complete HTTP response in a local file, map status 503 to that file in a named http-errors section, and attach the section to the frontend (or another proxy section) with errorfiles. Validate the configuration and reload HAProxy after every file change: HAProxy reads error files at configuration load and keeps them in memory.
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This changes HAProxy’s own 503 response. It does not automatically replace a 503 body sent by your application backend; that requires an explicit response rule.
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HTTP status 503 means “Service Unavailable.” HAProxy can generate that response when it cannot select a usable backend server, all servers are down, a connection cannot be established, or another proxy-level condition prevents forwarding the request. In those cases, HAProxy can serve a locally defined response instead of its built-in error page.
There are two different 503 origins to keep separate:
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- HAProxy-generated 503: the load balancer creates the status because it cannot complete the request. An
errorfile 503mapping applies here. - Backend-generated 503: an application server receives the request and returns status 503 itself. HAProxy normally forwards that response unchanged. An
errorfilemapping alone does not replace it.
The distinction determines which configuration you need. Start with a static error file for proxy-generated failures. Add response interception only if you intentionally want to replace application responses too.
Minimal configuration for a static 503 page
The smallest reusable configuration has three parts: a named error group, an errorfile entry for status 503, and an errorfiles reference in the frontend that can emit the error.
# /etc/haproxy/haproxy.cfg
http-errors myerrors
errorfile 503 /etc/haproxy/errorfiles/503.http
frontend www
bind :80
default_backend webservers
errorfiles myerrorsThe path should be absolute. The file name does not have to end in .http, but that suffix is recommended because it makes the file’s purpose obvious. The named group can be attached to more than one frontend when the same response should be reused.
The errorfiles directive belongs in the proxy section whose errors you want to customize. For a normal HTTP site, that is commonly a frontend. If you have separate frontends, each one needs its own reference unless it inherits the setting through another supported configuration arrangement.
Build the complete response file
An HAProxy errorfile is not just an HTML fragment. It must contain a complete HTTP response: a status line, response headers, one empty line, and the body.
HTTP/1.1 503 Service Unavailable
Cache-Control: no-cache
Content-Type: text/html; charset=utf-8
<!doctype html>
<html lang="en">
<head><meta charset="utf-8"><title>Temporarily unavailable</title></head>
<body>
<h1>Service temporarily unavailable</h1>
<p>Please try again shortly.</p>
</body>
</html>Status line
HTTP/1.1 503 Service Unavailable identifies the protocol version, numeric status, and reason phrase. Keep the numeric status at 503 so monitoring systems, clients, and caches receive the intended result.
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Headers
Content-Type: text/html; charset=utf-8 tells browsers to render the body as UTF-8 HTML. Cache-Control: no-cache prevents a temporary outage page from being treated as a long-lived success or failure document by intermediaries that honor that directive. Add other headers only when you understand their effect; the response file is sent as the response HAProxy generates.
Body and separator
The blank line between headers and HTML is required HTTP syntax. Keep the HTML self-contained if the page must work while every backend is unavailable. References to an unavailable application, a private network path, or a separate asset host can make the page appear broken during the exact outage it is meant to explain.
Step-by-step installation
- Create a dedicated directory. For example, create
/etc/haproxy/errorfilesusing the account or deployment method appropriate to your operating system. - Write the response file. Save the complete response as
/etc/haproxy/errorfiles/503.http. Preserve the header/body blank line and use valid HTML if you are serving an HTML page. - Set readable permissions. The HAProxy process must be able to read the file when it loads its configuration. If the service is chrooted, the path must also be available inside the configured chroot. Avoid making the file writable by an untrusted account.
- Add the error group. In the global configuration file, add
http-errors myerrorsfollowed by an indentederrorfile 503line with the absolute path. - Attach the group. Add
errorfiles myerrorsto the frontend or other proxy section whose HAProxy-generated 503 responses should use the file. - Validate before applying. Run the configuration parser for the installed version, such as
haproxy -c -f /etc/haproxy/haproxy.cfg. Treat any warning or error as a deployment failure until it is understood. - Reload HAProxy. Use the reload mechanism supplied by your service manager or package. There is no single universal command because distributions and service layouts differ. A restart is not inherently required, but the running process must load the new configuration and file.
- Test a controlled failure. Make a backend unavailable in a maintenance window or use a test frontend whose backend has no available servers. Confirm the status, headers, and body with a browser and an HTTP client.
Do not edit the file and expect an already running process to notice it. HAProxy reads and stores custom error files in memory at the same time it reads the configuration. Every content change therefore requires another successful load and reload.
How to verify the result safely
Testing a normal healthy request proves only that the frontend works; it does not prove the 503 path. Use an isolated test listener or a maintenance backend whenever possible.
Check the wire response
Request the affected listener with a client that displays headers and the body, for example:
curl -i http://your-test-host/When HAProxy itself produces the failure, the response should have status 503, the headers from your file, and the HTML or text body you supplied. Check the actual response rather than relying on a browser cache or a page previously loaded through a different frontend.
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Confirm which component generated the status
Inspect HAProxy logs and the backend’s logs for the same request. If the application logged and returned the request, you are testing a backend-generated 503, so the basic errorfile mapping is not expected to change its body. If no backend handled the request and HAProxy reports that no server was available, the local error file is the relevant path.
Test after every deployment change
Validate the configuration before reload, then repeat the controlled request after reload. A successful parser check confirms syntax and file loading, while the HTTP request confirms that the intended frontend actually references the error group.
Why an edited page does not appear until reload
The most common explanation is HAProxy’s load-time behavior. The process reads the error file and stores its contents in memory while loading the configuration. Updating 503.http on disk changes nothing for existing workers until a new configuration load occurs.
- Confirm that you edited the exact absolute path in the active configuration.
- Run the version-appropriate configuration check after the edit.
- Reload the service through its service manager and verify that the reload succeeded.
- Send a request that reaches the same frontend; a different listener may use another
errorfilesgroup. - Use a cache-bypassing client during testing. The response file’s
Cache-Control: no-cacheheader helps, but an intermediary can still have its own behavior.
If the reload fails, the old process may continue serving the previous page. Check the service manager’s status and logs rather than assuming the file was accepted.
Replacing a 503 returned by the backend
To replace an application’s 503 body, define the error group as usual and add an http-response return rule conditioned on the response status.
http-errors myerrors
errorfile 503 /etc/haproxy/errorfiles/503.http
frontend www
bind :80
default_backend webservers
errorfiles myerrors
http-response return status 503 default-errorfiles if { status 503 }This rule examines the response and returns status 503 using the selected default error files when the backend response status is 503. It replaces the backend’s response body and headers for matching responses. That is deliberately broader than customizing HAProxy’s own outage page: application-specific diagnostics, headers, or retry instructions can be lost.
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When interception is appropriate
- Use it when every 503 presented to clients must have one consistent maintenance design.
- Use it when backend services expose internal details that should not reach users.
- Avoid it when different applications need distinct 503 bodies or headers.
- Avoid it when the backend’s 503 includes meaningful machine-readable data that clients depend on, unless you reproduce that contract.
Test both failure paths separately. A backend outage that prevents connection and an application that deliberately returns 503 exercise different HAProxy behavior.
Redirecting instead of serving a local file
HAProxy can redirect an HAProxy-generated 503 with errorloc 503 <url>. The errorloc and errorloc302 forms document 302 behavior, while errorloc303 returns 303 See Other. A 303 instructs clients to fetch the destination with GET, which is generally safer when the original request was not a GET, such as a form submission.
Redirecting changes the client-visible behavior: the client receives a second request rather than the original local response body. Ensure the destination is available independently of the failed backend. A relative URL must not point to a resource that can produce the same error, or the client can enter a redirect loop.
These directives apply to errors generated by HAProxy. They do not rewrite a 503 that originated in the backend application; use an explicit http-response rule if that is required.
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A static errorfile is the simplest and most predictable option. For template-driven responses, HAProxy’s http-error directive supports lf-file and lf-string forms that can render sample-fetch expressions.
file and lf-file are not interchangeable
The tutorial syntax distinguishes lf-file, which renders content as a log-format template, from file, which serves raw content. Choose lf-file only when you need HAProxy to evaluate supported sample-fetch expressions. If the file should be delivered literally, use the raw form instead.
Set the content type for templates
When returning a template directly, set an appropriate content-type. Without an explicit type, clients may not interpret the generated body as intended. Keep expressions limited to values that are safe to expose; an outage page should not leak request data, internal addresses, or sensitive headers.
Dynamic forms are useful for a small amount of request-aware text, but they add syntax and validation complexity. For a branded page that never changes per request, a static full response is easier to review and less likely to fail during an outage.
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Choosing an implementation
| Approach | Best for | Response behavior | Main caveat |
|---|---|---|---|
Static errorfile 503 |
HAProxy-generated 503s with one fixed page | Serves a complete local HTTP response | Requires a reload after file edits |
http-response return on status 503 |
Replacing backend-generated 503s | Returns the selected HAProxy error response | Overwrites backend body and headers |
errorloc 503 or errorloc302 |
Redirecting clients to another URL | Uses documented 302 redirect behavior | Destination availability and loops must be managed |
errorloc303 |
Redirecting non-GET requests safely | Uses 303 so the follow-up request is GET | Still depends on an independent destination |
http-error with lf-file or lf-string |
Template-driven or request-aware content | Renders log-format expressions | More syntax and exposure considerations than static files |
Version, size and compatibility limits
The documented http-errors approach applies to HAProxy 2.1 and newer, along with corresponding Enterprise and ALOHA versions. Directive availability and the list of customizable statuses can vary by release, so check the manual for the exact version deployed on each server.
Error files are parsed during configuration loading and retained in memory. The response must fit the configured response buffer. A malformed response can fail configuration validation; an oversized response can fail validation or serving. Keep the page compact, remove unnecessary inline assets, and test the real file on the real HAProxy build before relying on it for production maintenance.
Mixed-version fleets deserve special care. A configuration accepted on one node may use a directive unavailable on an older node. Validate on every version that will receive the configuration, and roll out in a way that preserves a working listener if a node rejects the new file.
Quick Recap
Troubleshooting checklist
| Symptom | Likely cause | What to check |
|---|---|---|
| Built-in HAProxy page still appears | The error group is not attached to the active frontend, or the process was not reloaded | Confirm errorfiles myerrors, the active configuration path, reload status, and the frontend receiving the request |
| Old custom page appears | The file was edited after configuration load | Validate and reload; HAProxy keeps loaded content in memory |
| Application 503 is unchanged | The status came from the backend | Inspect logs and add a deliberate http-response return rule if replacement is intended |
| Configuration check fails | Malformed response, unsupported directive, bad path, or unreadable file | Check the exact HAProxy version, absolute path, permissions, response syntax, and file size |
| Page is blank or garbled | Missing header/body separator, incorrect content type, or truncated response | Inspect the raw file and the raw HTTP response with a header-displaying client |
| Redirect repeats indefinitely | The redirect target reaches the same failing path | Use an independently available destination and avoid a relative URL that maps back to the failing resource |
Operational practices for dependable outage pages
- Keep the file self-contained. Inline the minimal CSS needed for readability so the page does not depend on a failed application or asset server.
- Review status and headers together. A page that looks correct in a browser can still return the wrong status or omit a required content type.
- Use a reusable group carefully. Sharing one named
http-errorsgroup reduces duplication, but a change then affects every attached frontend after reload. - Deploy atomically. Write and validate a complete replacement before reloading, rather than leaving a partially written file at the moment HAProxy reads it.
- Protect the file. Permit the HAProxy process to read it while preventing unauthorized edits that could alter every client-facing outage response.
- Test maintenance conditions. Include at least one test where no backend server is available and, if interception is configured, one where the backend deliberately returns 503.
- Preserve observability. A customized body should not prevent normal HAProxy logging and status monitoring. Alert on the 503 status, not on the text of the page.
Practical decision sequence
- Determine whether HAProxy or the backend is producing status 503.
- For an HAProxy-generated response, choose a static
errorfileunless you genuinely need templating or redirection. - For a backend-generated response, decide whether replacing its body and headers is acceptable before adding interception.
- Use an absolute path, a complete HTTP response, and permissions readable by the HAProxy process.
- Validate with the parser for the deployed version, reload, and exercise the exact frontend and failure mode.
- Check the raw status, headers, and body, then document which reload mechanism and test scenario your operations team should use next time.
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