Scope of generation and positioning of the server block template
This tool is a generator to build a template for Nginx server blocks from values specified in the form. It does not create the entire nginx.conf, and will not output the global scope for process counts, the events block, the http block, common log formats, or include configurations.
You must check existing configurations like nginx.conf, conf.d, or sites-enabled, and judge where to place the output server block according to your environment.
In the basic configuration items, specify the hostname to be assigned to server_name, the listening port, the absolute root directory path for serving static files, and space-separated index filenames.
The generated server_name directive outputs solely your trimmed hostname input exactly as provided; it performs no automatic www. subdomain prepending, wildcard expansion, or fallback domain aliasing.
If your production service requires supporting both the apex domain and a www prefix, you must manage those domain variants through explicit configuration blocks or separate redirect servers in your operational environment.
The root location / block adopts the standard single-page application fallback directive try_files $uri $uri/ /index.html;. Under this rule, Nginx inspects the file system sequentially to determine whether the requested URI matches an existing static file or directory; if neither exists, it routes the request internally to /index.html.
Note that this root fallback does not override a separately selected proxy location. While this behavior enables client-side routing frameworks (such as React, Vue, or Angular) to handle deep links seamlessly, requests for missing paths may become HTML responses if /index.html exists and is served normally, rather than returning an HTTP 404 Not Found.
You should always inspect the actual status code and headers returned by your server. For traditional static websites, content management platforms, or API-centric setups, you should review and adjust this fallback structure to ensure missing files trigger genuine 404 error handling.
Furthermore, you can add arbitrary SSL settings, HTTP to HTTPS redirection, fixed security headers, arbitrary CSP, Gzip, static file caching, multiple reverse proxy locations, and fixed error page designations.
These are starting points arranged by concatenating the selected items as strings, and not a finalized configuration integrated with other settings on the host.
Input validation and manual verification of configuration strings
Because Nginx configuration files derive their structural block hierarchy from line breaks, curly braces, and terminating semicolons, directly concatenating unvalidated form values into a template creates the risk of unintended directive injection.
To prevent structural corruption of the generated configuration snippet, this tool enforces format validation on relevant input fields.
Not every field is checked in every mode: SSL certificate and private key paths are only checked when SSL mode is on, and the Content-Security-Policy input is only validated when security headers are enabled and non-empty.
Whenever even a single validation error is present, the configuration preview remains completely blank and the clipboard copy button is disabled.
However, this limited input validation is strictly designed to maintain safe syntactic boundaries for the generated text snippet; it is not a complete Nginx configuration parser, nor does it guarantee runtime execution semantics, verify path existence on your target server, or test whether the resulting directives align with your server's operational policies.
For the hostname field, the generator accepts localhost, a single ASCII label, or dot-separated ASCII hostname labels composed of alphanumeric characters and hyphens, without requiring fully qualified domain names.
It strictly rejects trailing dots, empty labels, labels beginning or ending with a hyphen, individual labels exceeding 63 characters, and total hostname lengths beyond 253 characters.
The listen port must be an integer ranging from 1 to 65535; this numeric boundary is validated regardless of whether SSL mode is enabled with default port 443 and 80 bindings.
The document root path, SSL certificate path, and private key path must all be slash-prefixed ASCII absolute paths consisting of allowed ASCII characters (/, alphanumeric, ., _, ~, -); paths containing parent directory traversal segments (..) or characters outside this set are rejected.
The certificate and private key paths are validated conditionally only when SSL is toggled on. Finally, the index setting accepts up to 20 filenames separated by spaces, including repeated spaces (ASCII control characters such as tab, CR, and newline inside the list are rejected before splitting); each index name must begin with an alphanumeric character and may include letters, digits, dots, underscores, and hyphens.
Reverse proxy location rules must be slash-prefixed paths; the generator rejects a standalone root /, duplicate prefix paths across rules, and characters that could disrupt configuration blocks.
Proxy upstream destinations are restricted to fixed HTTP or HTTPS URLs up to 2048 characters in length, rejecting embedded user credentials, URL hash fragments, whitespace, configuration separators, and Nginx $ variables.
After trimming surrounding whitespace, the upstream path, query parameters, trailing slash, and percent-encoding are preserved exactly without URL normalization.
The optional Content Security Policy (CSP) field accepts up to 4096 characters and is rendered as a double-quoted directive value.
It permits semicolon-separated directives and single-quoted source expressions (such as 'self' or 'unsafe-inline'), but strictly blocks double quotes, line breaks, control characters, curly braces, #, backslashes, and $ variables.
This distinction exists because each configuration directive requires specific syntactic allowances to remain functional while preventing text injection.
SSL and redirection from HTTP to HTTPS
When SSL is enabled, it outputs a template with listen 443 ssl http2, absolute paths for the certificate and private key, TLS 1.2 and TLS 1.3, cipher suites, session cache, and timeout in the HTTPS server block.
Note that since Nginx 1.25.1, http2 on is available and listen ... http2 is deprecated. If HTTP to HTTPS redirection is also enabled, a separate server block listening on port 80 to 301 redirect requests to the HTTPS URL of the same host and URI is prepended.
If redirection is disabled, port 80 is added to the same server block. Check that ports do not conflict with existing server blocks.
Even if the certificate path in the input field is formatted correctly, it does not mean the file exists on the server. The validity period of the certificate, combination with the private key, permissions, certificate chain, and target hostname are not verified.
The format of listen 443 ssl http2 may be treated differently depending on the Nginx version, and browsers cannot verify if the necessary modules are built-in.
Refer to the official documentation and build options for the version you are using.
If security headers are enabled simultaneously, HSTS (max-age=31536000; includeSubDomains) is also output when SSL is on. Since HSTS instructs browsers to use HTTPS for a long period, applying it without confirming that operational preparations, including subdomains, are complete may affect reachability.
It is important to separate the preparation of certificates and DNS switching, HTTP reachability, and confirmation of redirect destinations, and verify them in stages.
Configuration of static delivery, headers, compression, caching, and proxies
When security headers are enabled, the template adds X-Frame-Options configured as "SAMEORIGIN" always, X-Content-Type-Options as "nosniff" always, and Referrer-Policy as "no-referrer-when-downgrade" always.
The X-XSS-Protection header is not emitted in the generated template. When SSL is enabled alongside security headers, Strict-Transport-Security (HSTS) is also appended with a one-year max-age and includeSubDomains.
An optional Content-Security-Policy header is emitted inside double quotes only when non-empty input is provided. The default CSP configuration includes 'unsafe-inline', and the generator provides no semantic guarantee regarding policy soundness; users must review their policy carefully.
The character validation applied to CSP serves solely to prevent breaking out of the configuration file; it cannot evaluate whether the specified policy permits all scripts, stylesheets, fonts, images, media sources, or API endpoints required by your web application.
You must inspect live pages in modern browsers, review developer console output, and evaluate violation reports to refine your CSP rules.
Furthermore, regarding Nginx header inheritance behavior: directives defined via add_header in a parent server block do not universally cascade down to nested location blocks (such as cached static asset blocks) if those child blocks declare their own add_header statements, though official documentation supports add_header_inherit since version 1.29.3; because inheritance behavior changes depending on your Nginx version and configuration, child block inheritance is not universal.
You must test actual HTTP response headers directly against your running server to confirm header delivery across all asset paths.
Enabling Gzip adds fixed directives including compression level 6 and MIME types like text, CSS, XML, JSON, JavaScript, and SVG. For static caching, it outputs expires and Cache-Control templates targeting image and video extensions for 1 month, and CSS and JavaScript for 1 year.
In environments not using content hashes in file names, long-term caching may delay update reflection, so a review matching the delivery method is necessary.
Fixed error_page specifies 404 and 50x series, but does not check if the referenced files exist.
Multiple reverse proxies can be added, outputting proxy_pass, HTTP/1.1, Upgrade and Connection, Host, X-Real-IP, X-Forwarded-For, and X-Forwarded-Proto headers to each location.
Even if the URL format is correct, whether the upstream service is running, whether URI translation by a trailing slash in the path works as intended, and how to handle timeouts or request sizes are separate considerations.
Check including location matching rules and inheritance from existing configurations.
Items that cannot be verified in the browser and the role of nginx -t
This tool does not start the Nginx binary and does not pass the generated configuration to the Nginx parser. Therefore, having no errors on the screen does not mean nginx -t will succeed.
The tool itself does not run nginx -t. Syntax errors or unintended behaviors may occur depending on the Nginx version, installed modules, include order from the main configuration, duplication of identical server_name or listen directives, and directives inherited from parent blocks.
Furthermore, it does not verify whether DNS points to the target server, if the certificate and private key can be read, if the upstream URL can be connected, if file permissions under root are appropriate, or if fixed error pages exist.
Semantic validity, such as whether CSP, cache durations, TLS settings, or forwarded headers meet application requirements, is also out of scope.
You must consider input formatting and configuration verification including the operational environment separately.
After saving the generated results, manually execute nginx -t on the complete set of configurations to be loaded, and check the displayed file names and line numbers.
Even if it passes the syntax check, separately test HTTP responses, HTTPS connections, static files, reverse proxies, caches, and the display of main pages.
Procedures for reflecting the template according to the environment
First, check how to backup existing configurations and their locations, and compare to ensure the generated server block does not conflict with current listen, server_name, and location settings.
Next, review environment-specific values like certificate paths, root, index, upstream URLs, and error pages. Keep only necessary functions, and organize so items already specified in existing common configurations are not duplicated.
Then, verify the Nginx version and available modules, and adjust each directive against the official documentation. In particular, the method for specifying HTTP/2, TLS-related defaults, add_header inheritance, trailing slashes in location and proxy_pass, and long-term cache targets are areas where environment differences easily surface.
Check syntax with nginx -t, try typical URLs and error behaviors in a staging environment, and then reflect them according to operational procedures.
Commands to reflect configurations or manage services vary by OS, container, management panel, or process management method. Do not blindly choose a specific reload method; check the procedures, rollback methods, and monitoring items defined for that environment.
The role of this tool ends at assembling frequently used server block elements from input values; design judgments and production environment verification are performed by administrators.