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“Customize the NGINX server name” can mean three different changes. Use server_name when you need a domain to select a virtual server; compile with --build=NAME and enable server_tokens build when you want a build label exposed with the version; edit src/core/nginx.h and rebuild when you must replace the literal NGINX product name in the open-source binary. These changes affect different outputs and should not be treated as interchangeable.
Decide which “server name” you need to change
NGINX uses several names in separate parts of its operation. Choosing the wrong setting can leave routing unchanged, expose a different header than expected, or require a rebuild you did not need.
| Goal | Use | What changes | Rebuild required? |
|---|---|---|---|
| Send a domain to a particular virtual host | server_name in a server {} block |
Virtual-server selection for requests | No |
| Show an internal build label beside the NGINX version | ./configure --build="NAME" plus server_tokens build |
Version/build information in supported NGINX output, including the Server header |
Yes, to add or change the label |
| Replace the literal NGINX product name emitted by the binary | Edit src/core/nginx.h, then rebuild |
Product branding in protocol headers and special pages generated by the binary | Yes |
| Make absolute redirects use one canonical host | server_name_in_redirect |
Host name used in NGINX-generated absolute redirects | No |
The first option is a configuration change. The second attaches metadata to a source build. The third changes compiled source. The redirect directive is independent of all three.
Change virtual-host routing with server_name
Use server_name when requests for a domain should reach a particular server {} block. NGINX’s server-names guide states that names determine which server block is used and supports exact names, wildcards, and regular expressions: https://nginx.org/en/docs/http/server_names.html.
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Configure the name in the correct server block
server {
listen 80;
server_name example.org www.example.org;
root /srv/www/example;
index index.html;
location / {
try_files $uri $uri/ =404;
}
}Put every hostname that should share this virtual host on the same server_name line, separated by spaces. The listen directive still determines the address and port on which the block accepts connections; changing server_name does not create DNS records, open a firewall port, or provision a TLS certificate.
Understand matching precedence
When several server blocks listen on the same address and port, NGINX evaluates names according to its documented precedence. An exact name wins over wildcard names. Among wildcards, the longest matching wildcard is selected. Regular expressions are considered after the name-based wildcard checks, in configuration order. Keep overlapping patterns deliberate; a broad wildcard placed before a needed regular expression can produce an unexpected virtual host.
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server {
listen 80;
server_name *.example.org example.org;
}
server {
listen 80;
server_name api.example.org;
}With these blocks, the exact api.example.org name is more specific than *.example.org. A wildcard does not automatically cover the bare parent domain, so include example.org explicitly when it must resolve to the same block.
Check the request path before blaming NGINX
- Verify that DNS for the requested hostname points to the server being tested.
- For HTTPS, ensure the certificate and TLS SNI configuration cover the same hostname; HTTP virtual-host matching cannot repair a certificate mismatch.
- Confirm that the request includes the intended
Hostheader. Testing an IP address without a host header normally selects the default server for that listening socket.
Validate and activate a server_name change
Always test the configuration that the running service will use, including its intended prefix and include files. A successful edit on disk does not mean the worker processes have loaded it.
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- Back up the active configuration and identify the binary and prefix:
command -v nginx nginx -V 2>&1Record the reported configure arguments, prefix, and configuration path before making changes.
- Edit the appropriate
server {}block and save the file. - Run a syntax and file-reference check. If the service uses a nondefault prefix or configuration file, specify both explicitly:
nginx -t -p /usr/local/nginx -c conf/nginx.confUse the same
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sudo nginx -s reloadOn systems managed by a service supervisor, use that supervisor’s reload action instead, such as
sudo systemctl reload nginx. - Verify routing with an explicit host header. Replace the address with the server under test:
curl -i -H 'Host: example.org' http://203.0.113.10/For HTTPS testing against a specific address, use a tool and options that preserve the requested hostname and certificate verification behavior rather than testing only the IP.
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If nginx -t reports an error, do not reload. Fix missing semicolons, duplicate or malformed directives, unreadable certificate/key files, and incorrect include paths first.
Control the name used in absolute redirects
Routing and redirects are separate decisions. The server_name_in_redirect directive controls the host used in absolute redirects generated by NGINX. When it is enabled, NGINX uses the primary name from the relevant server_name directive. When it is disabled, NGINX uses the request’s Host header, or the server IP address when no Host header is present.
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listen 80;
server_name example.org www.example.org;
server_name_in_redirect on;
location /old-path {
return 301 /new-path;
}
}Place the directive in the http, server, or applicable context supported by your NGINX version. This setting does not alter the Server response header, virtual-host matching, or the compiled product name.
Add a custom build label during a source compilation
If the goal is to identify a particular binary rather than rename the software, add a build label at configure time. The source-build process uses ./configure to generate the build configuration, then compiles and installs with make.
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Configure, compile, and install with --build
cd /path/to/nginx-source
./configure --build="Acme-Web-2026" [other options]
make
sudo make installKeep the original configure options when rebuilding an existing installation. They may specify modules, libraries, compiler flags, user and group settings, temporary directories, or a nondefault installation prefix. Omitting one can produce a binary that starts but behaves differently from the previous deployment.
Expose the label with server_tokens build
http {
server_tokens build;
server {
listen 80;
server_name example.org;
}
}server_tokens build is valid in http, server, and location contexts. On a build that supports this value, NGINX includes the configured build name together with the NGINX version in the relevant output. Scope it at http level when the behavior should be consistent across virtual hosts, or override it in a narrower context when only one site should expose the label.
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Know what server_tokens does and does not do
| Value | Effect | Availability and implication |
|---|---|---|
on |
Emits the NGINX version on error pages and in the Server response header. |
Standard behavior; reveals more version detail. |
off |
Suppresses the version on error pages and in the Server response header. |
Does not create a replacement product name. |
build |
Adds the build label along with the NGINX version where supported. | Requires a binary configured with --build=NAME. |
string |
Replaces the emitted value with an explicit string. | The HTTP core reference documents this as an NGINX commercial-subscription feature from version 1.9.13; do not assume it is available in an open-source build. |
The current open-source source accepts on, off, and build as the relevant enum values. If server_tokens build fails configuration testing, inspect the version and build you actually installed instead of silently substituting an unsupported value.
Replace the literal NGINX branding in an open-source build
Configuration cannot replace the product name compiled into the open-source binary. For that requirement, change the branding definitions in src/core/nginx.h, then rebuild and install a separately identifiable binary. A development ticket identifies this file as the single source location whose values propagate to client-facing protocol headers and the server name shown on special pages.
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Use a controlled source patch
- Obtain the exact NGINX source version currently deployed and place it under version control.
- Save the running binary path,
nginx -Voutput, configure arguments, active prefix, service unit, configuration tree, and module list. - Back up the configuration and the unmodified source tree. Keep the branding change as a small, reviewable patch rather than editing an installed binary.
- Open
src/core/nginx.hin the source release you are building. Identify the server-name and version definitions used by that release; do not assume symbol names or surrounding code are identical across versions. - Change only the intended literal values, preserving valid C syntax and the version information needed for operational identification.
- Rerun the original
./configurecommand with the same options, then compile:
./configure [the original options]
make- Install to a staging prefix first when possible. A separate prefix lets you test the new binary without replacing the known-good executable:
./configure --prefix=/opt/nginx-branded [the original options]
make
sudo make install- Inspect the staged binary’s version/build output and start it against a copied configuration on a test port. Confirm the expected header and special-page behavior before changing the production service.
- Switch the service to the staged binary only after configuration validation, health checks, and a rollback plan are ready.
Branding changes can affect more than one response surface. Check normal responses, generated error pages, and any protocol output that exposes the compiled server name. Reverse proxies, CDNs, or downstream applications may independently rewrite or add headers, so inspect the response at the client boundary where the name matters.
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| Approach | Primary output affected | Rebuild | Open-source status | Rollback complexity |
|---|---|---|---|---|
server_name |
Virtual-host routing | No | Open-source configuration directive | Low: restore the configuration and reload |
server_name_in_redirect |
Host in NGINX-generated absolute redirects | No | Open-source configuration directive | Low: restore the directive and reload |
--build + server_tokens build |
Build label and version in supported output | Yes, to change the label | build is available in supported open-source builds |
Moderate: switch binaries, then reload |
Source edit in src/core/nginx.h |
Literal product branding in compiled output and special pages | Yes | Open-source path, maintained as a private patch | Highest: preserve the prior binary, patch, and matching configuration |
Do not use a source edit merely to route a domain, and do not expect server_name to change the Server header. Conversely, hiding the version with server_tokens off is not the same as replacing the product name.
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- Inventory the deployment. Record the executable path,
nginx -Voutput, configure arguments, service manager, prefix, active configuration file, and include tree. - Classify the requirement. Choose routing, build identification, literal branding, or redirect canonicalization before editing anything.
- Back up. Save
nginx.conf, included files, certificates and keys’ references, the source tree or patch, and the currently working binary. - Make the smallest change. Edit only the relevant server block, directive, configure option, or source definition.
- Validate against the intended installation. Run
nginx -twith the correct-pand-cvalues. For a rebuilt binary, test its own configuration and module set rather than the system copy. - Stage rebuilt binaries. Install source changes under a separate prefix, verify metadata and responses, and retain the previous executable.
- Reload, do not restart unnecessarily. A reload lets NGINX validate and replace workers while preserving established service behavior; use the service manager’s documented action where applicable.
- Verify externally. Test the intended host header, redirect location, response headers, generated error pages, and HTTPS behavior from a client outside the local process.
Troubleshooting common outcomes
The request still reaches the wrong virtual host
- Check the request’s
Hostheader and the listening address/port. - Look for an exact name or longer wildcard in another server block that wins by precedence.
- Confirm the edited file is included by the running configuration and that the reload succeeded.
- Test DNS and, for HTTPS, SNI and certificate selection separately.
The Server header still says NGINX
server_name changes routing only. server_tokens off hides the version but does not supply a replacement product name. An open-source literal branding change requires the source edit and rebuilt binary described above; an upstream proxy may also be generating the header you are observing.
server_tokens build is rejected
- Confirm that the running binary is the one rebuilt with
--build=NAME, not a distribution package or older installation earlier inPATH. - Run the configuration test with that binary and inspect its version/build output.
- Check the release’s supported directive values. Do not replace it with
server_tokens stringin an open-source build, because explicit string replacement is documented as commercial functionality.
The branded binary will not start
- Compare its configure arguments, dynamic modules, library paths, user/group settings, and prefix with the previous binary.
- Run its configuration test with absolute paths and inspect the error log.
- Restore the prior executable and configuration if the failure affects service availability, then investigate the staged build offline.
Redirects use an unexpected hostname
Inspect server_name_in_redirect, the primary name ordering in the relevant server_name directive, and the incoming Host header. Remember that this directive affects NGINX-generated absolute redirects, not arbitrary redirect URLs explicitly written in application code.
Rollback and maintenance considerations
Keep the previous executable, its configure arguments, the unmodified source, and the last-known-good configuration together. A source-level branding patch must be reapplied whenever you upgrade to a new NGINX release; never assume the same source context or definitions exist unchanged. Rebuilds should be reproducible from a recorded command or build script, and the resulting binary should be clearly named or stored under a dedicated prefix so an operator cannot confuse it with the system installation.
Finally, treat branding as an operational choice, not a security control. Suppressing version text can reduce casual disclosure, but it does not patch vulnerabilities, alter request routing, or prevent fingerprinting through other behavior. Keep the actual NGINX version and build provenance available to administrators even when public responses expose less information.
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