Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsUse two matching settings: add a hostname-to-IP entry in Windows’ hosts file, then use that identical hostname as the site address in Caddy. For a site running on the same PC, an entry such as 127.0.0.1 myapp.test sends that name to the local machine. Caddy can then serve https://myapp.test with its local certificate authority. Name resolution and certificate trust are separate: the hosts entry can be correct while the browser still warns that the HTTPS certificate is untrusted.
What this setup does
Windows checks its local hosts file before attempting normal DNS resolution for a name. A line in that file associates an IP address with one or more hostnames on that computer. It is a per-device override, not a DNS record published to your network or the public internet.
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Caddy uses the hostname in its site address to select a configuration. It matches the request’s Host header, so the browser name, hosts-file name and Caddy site address must agree character for character. Resolving two different names to 127.0.0.1 does not make them interchangeable in Caddy.
For local and internal names, Caddy can issue certificates from its own local certificate authority instead of using ACME validation. The first HTTPS visit may still produce a trust warning until the Caddy root certificate is trusted by Windows and, where applicable, by the browser’s separate certificate store.
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Before you begin
- Use a Windows account that can approve administrator access when saving the hosts file.
- Install Caddy and place a
Caddyfilein a known development directory. - Know where your application listens, such as
127.0.0.1:3000, or have static files ready for Caddy’s file server. - Choose a development hostname. A suffix such as
.testis only an example; the hosts file does not require that suffix.
Do not use a hosts-file mapping when you need every device on a LAN to resolve the name. Each client would need its own entry; network DNS is the appropriate mechanism for shared resolution.
Step 1: Choose the hostname and destination
Decide the exact name you will type in the browser. For a service on the same Windows computer, map it to the loopback address:
127.0.0.1 myapp.testIf the service is bound to another local address, use that address instead. The IP must be the address where the web server is reachable from Windows. Keep the hostname lowercase in your notes and configuration to avoid accidental mismatches, although DNS names are generally case-insensitive.
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You can place a comment after an entry with a # character. Keep one mapping per line and avoid adding an extension to the file name; Windows expects a file literally named hosts.
Step 2: Edit the Windows hosts file as administrator
Microsoft documents the usual location as C:WindowsSystem32driversetchosts. The etc directory may appear to contain files without familiar extensions, and File Explorer can hide the hosts file if you filter for text documents.
Using Notepad
- Open the Start menu, type Notepad, right-click it and choose Run as administrator.
- In Notepad, select File > Open.
- Browse to
C:WindowsSystem32driversetc. - Change the file-type filter from Text Documents (*.txt) to All Files (*.*).
- Select
hosts, add your mapping, and save.
If Notepad was not elevated, saving can fail or create a separate hosts.txt file that Windows ignores. Check the full name after saving.
Using PowerToys Hosts File Editor
Microsoft’s PowerToys Hosts File Editor provides a graphical alternative. Open the utility with its administrator mode enabled, add the IP address and hostname in separate fields, then save the entry. The elevated mode matters because the hosts file is protected under the Windows system directory. PowerToys also warns that edits can change name resolution for applications on that computer.
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Verify the line
Open the file again as administrator and confirm that the line contains the intended address and exact hostname, with no accidental .txt extension or invisible typo. A hosts entry affects only the Windows installation where you made it.
Step 3: Use the same name in Caddy
Write a site block whose address is exactly myapp.test. The handler depends on whether you are serving files or forwarding to an application.
Serve a directory
myapp.test {
root * C:pathtoyoursite
file_server
}Replace the path with the directory containing your HTML, CSS and other assets. Caddy’s site address is the first line; do not substitute localhost, an IP address or a second alias unless you intentionally configure additional site addresses.
Reverse-proxy an application
myapp.test {
reverse_proxy 127.0.0.1:3000
}The application must already be listening on the target address and port. Caddy receives the browser request for myapp.test and forwards it to the upstream service. The browser continues to use the custom hostname, which is important for testing host-based routing, cookies and redirects.
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If you need several names, give each one a hosts-file entry and a corresponding Caddy site block, or list multiple addresses on one Caddy site block when they should share identical handling. Every name you type must resolve locally and must be present in the Caddy configuration that is loaded.
Step 4: Start and reload Caddy
Open a terminal in the directory containing the Caddyfile and start Caddy with that configuration. A typical invocation is:
caddy run --config CaddyfileCaddy serves local sites over HTTPS by default and may ask for permission to install its local root certificate. Approve that operation only if you trust the Caddy installation and understand that it adds a local certificate authority to the machine’s trust store.
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When you edit the Caddyfile, reload the running process rather than stopping it unnecessarily:
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caddy reload --config CaddyfileTo stop the process, use:
caddy stopCaddy stores application data, including certificates, under its Windows data directory. Caddy documents this location as %AppData%Caddy. Avoid deleting that directory casually; doing so can remove the local CA material and cause certificates to be regenerated.
Step 5: Open the exact HTTPS address
Navigate to:
https://myapp.testDo not test with https://127.0.0.1 if your Caddy site is named myapp.test. The IP address may reach the same process, but it sends a different host value and can select another site or produce Caddy’s default response.
If the page loads without a warning, Windows and the browser trust the Caddy local root. If a warning appears, the hosts mapping may still be working perfectly. Resolve trust separately:
- Confirm that Caddy completed its local CA installation and that the operation was allowed to run with the required permissions.
- Check the Windows trusted root store for Caddy’s local root certificate according to Caddy’s Windows trust-store documentation.
- Check the browser’s trust model. Some browsers use the operating-system store; others maintain a separate store or apply additional enterprise policy.
- Close and reopen the browser after changing trust settings, then revisit the same HTTPS hostname.
Do not replace the HTTPS URL with an HTTP URL merely to hide a trust warning if your goal is to test secure cookies, redirects or browser security behavior.
Hosts file or DNS: which should you use?
| Question | Hosts-file override | DNS configuration |
|---|---|---|
| Where does the mapping apply? | Only on the Windows computer containing the entry. | To clients that use the configured DNS service. |
| Is a public domain required? | No. You can use a development hostname without publishing it. | Private DNS can use an internal namespace; public DNS normally requires a registered domain. |
| Can the name be reached from the internet? | No. A local mapping does not publish a route or record. | Only when DNS, routing, firewall rules and hosting are configured for external access. |
| How does Caddy issue HTTPS? | Caddy can use its local CA for the internal name. | For public HTTPS, Caddy’s automatic HTTPS flow generally assumes a registered public domain and reachable ports 80 and 443; internal names can still use Caddy’s local CA. |
| Best use | One developer machine, quick local projects and isolated testing. | Several computers, shared test environments or centrally managed naming. |
A hosts entry is often the least disruptive choice for a single workstation because it avoids changing public DNS. It does not, however, make the name available to a phone, virtual machine or colleague’s laptop. Configure an appropriate DNS service when those clients must resolve the same hostname.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting by symptom
The browser shows the wrong site or Caddy’s default response
- Read the hostname in the address bar and compare it with the hosts-file entry.
- Compare that same spelling with the Caddy site address.
- Check for an unintended port, such as
myapp.test:8080, and verify which process owns the port receiving the request. - Reload Caddy after changing the Caddyfile.
Caddy chooses named sites from the request’s host value. Two names pointing to one IP do not automatically select one another’s site blocks.
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The hosts file will not save
Reopen the editor with administrator rights. In Notepad, elevation must happen before opening the file. In PowerToys, enable the Hosts File Editor’s administrator mode. Confirm that Windows did not save a text-document copy with a .txt extension.
HTTPS warns that the connection is not trusted
This indicates a certificate-trust issue, not necessarily a resolution issue. Caddy’s local HTTPS depends on its local root certificate. Install or repair that root in the Windows trust store using Caddy’s documented Windows procedure, then check whether your browser uses a separate trust store. The hostname on the certificate must also match the hostname in the address bar.
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- Verify the upstream address and port in
reverse_proxy. - Confirm that the application is running and listening on the interface Caddy uses.
- Keep the browser on the custom hostname so host-based redirects and cookies behave as they will in the intended environment.
- Reload the Caddyfile after correcting the upstream.
A second device cannot open the hostname
That is expected from a Windows hosts-file-only setup. The entry exists on one computer and is not distributed through DNS. Use network DNS or add a deliberate mapping on every test client, while ensuring the clients can route to the machine running Caddy.
Should you flush Windows DNS cache?
The documented setup does not require presenting a particular cache-flush command. First verify the file path, spelling, Caddy site address and active configuration. If a managed environment appears to cache an old result, follow your organization’s supported Windows networking procedure rather than applying an unverified command.
Local HTTPS versus public HTTPS
Local Caddy HTTPS is designed for names that are not publicly validated. Caddy creates certificates with its local CA, so the trust relationship must be established on each client that visits the site. This is useful for development features that require HTTPS, including secure cookies, service workers and redirect testing.
Public hosting is a different workflow. Caddy’s public HTTPS quick-start assumes a registered public domain and external access to ports 80 and 443 so certificate authorities can validate the site. A hosts-file line on your Windows computer cannot satisfy those requirements or make a private service public.
Quick Recap
A repeatable checklist
- Choose one hostname and record it exactly.
- Add
IP-address hostnametoC:WindowsSystem32driversetchostswith administrator access. - Put the identical hostname in the Caddyfile.
- Select
file_serverfor static content orreverse_proxyfor an application. - Start Caddy from the directory containing the Caddyfile.
- Approve and verify Caddy’s local CA trust setup.
- Open the HTTPS URL using the hostname, not an IP alias.
- After edits, run
caddy reload --config Caddyfile. - If another device needs the name, replace the single-host hosts override with suitable DNS.
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