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+---
+title: Configure server
+linkTitle: Server
+description: Configure the development server.
+categories: []
+keywords: []
+---
+
+These settings are exclusive to Hugo's development server, so a dedicated [configuration directory] for development, where the server is configured accordingly, is the recommended approach.
+
+[configuration directory]: /configuration/introduction/#configuration-directory
+
+```text
+project/
+└── config/
+    ├── _default/
+    │   └── hugo.toml
+    └── development/
+        └── server.toml
+```
+
+## Default settings
+
+The development server defaults to redirecting to `/404.html` for any requests to URLs that don't exist. See the [404 errors](#404-errors) section below for details.
+
+{{< code-toggle config=server />}}
+
+force
+: (`bool`) Whether to force a redirect even if there is existing content in the path.
+
+from
+: (`string`) A [glob](g) pattern matching the requested URL. Either `from` or `fromRE` must be set. If both `from` and `fromRe` are specified, the URL must match both patterns.
+
+fromHeaders
+: {{< new-in 0.144.0 />}}
+: (`map[string][string]`) Headers to match for the redirect. This maps the HTTP header name to a [glob](g) pattern with values to match. If the map is empty, the redirect will always be triggered.
+
+fromRe
+: {{< new-in 0.144.0 />}}
+: (`string`) A [regular expression](g) used to match the requested URL. Either `from` or `fromRE` must be set. If both `from` and `fromRe` are specified, the URL must match both patterns. Capture groups from the regular expression are accessible in the `to` field as `$1`, `$2`, and so on.
+
+status
+: (`string`) The HTTP status code to use for the redirect. A status code of 200 will trigger a URL rewrite.
+
+to
+: (`string`) The URL to forward the request to.
+
+## Headers
+
+Include headers in every server response to facilitate testing, particularly for features like Content Security Policies.
+
+[Content Security Policies]: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
+
+{{< code-toggle file=config/development/server >}}
+[[headers]]
+for = "/**"
+
+[headers.values]
+X-Frame-Options = "DENY"
+X-XSS-Protection = "1; mode=block"
+X-Content-Type-Options = "nosniff"
+Referrer-Policy = "strict-origin-when-cross-origin"
+Content-Security-Policy = "script-src localhost:1313"
+{{< /code-toggle >}}
+
+## Redirects
+
+You can define simple redirect rules.
+
+{{< code-toggle file=config/development/server >}}
+[[redirects]]
+from = "/myspa/**"
+to = "/myspa/"
+status = 200
+force = false
+{{< /code-toggle >}}
+
+The `200` status code in this example triggers a URL rewrite, which is typically the desired behavior for [single-page applications].
+
+[single-page applications]: https://en.wikipedia.org/wiki/Single-page_application
+
+## 404 errors
+
+The development server defaults to redirecting to /404.html for any requests to URLs that don't exist.
+
+{{< code-toggle config=server />}}
+
+If you've already defined other redirects, you must explicitly add the 404 redirect.
+
+{{< code-toggle file=config/development/server >}}
+[[redirects]]
+force = false
+from   = "/**"
+to     = "/404.html"
+status = 404
+{{< /code-toggle >}}
+
+For multilingual sites, ensure the default language 404 redirect is defined last:
+
+{{< code-toggle file=config/development/server >}}
+defaultContentLanguage = 'en'
+defaultContentLanguageInSubdir = false
+[[redirects]]
+from = '/fr/**'
+to = '/fr/404.html'
+status = 404
+
+[[redirects]] # Default language must be last.
+from = '/**'
+to = '/404.html'
+status = 404
+{{< /code-toggle >}}
+
+When the default language is served from a subdirectory:
+
+{{< code-toggle file=config/development/server >}}
+defaultContentLanguage = 'en'
+defaultContentLanguageInSubdir = true
+[[redirects]]
+from = '/fr/**'
+to = '/fr/404.html'
+status = 404
+
+[[redirects]] # Default language must be last.
+from = '/**'
+to = '/en/404.html'
+status = 404
+{{< /code-toggle >}}