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Image Artist: Web UI Shows 'Bad Request (400)' Error When Accessing Login Page

Nick Wyatt

May 22, 2026 15:47
Updated

Problem

When attempting to access the Image Artist web UI, the login page does not load and the browser displays:

Bad Request (400)

Cause

Image Artist is configured to serve its web interface using either an IP address or a domain name, but not both.

If the system is accessed using a different method than the one configured, the request is rejected.

Examples of mismatch:

Image Artist is configured for https://<domain_name> but accessed via https://<IP_address>
Image Artist is configured for https://<IP_address> but accessed via https://<domain_name>

How to confirm:

Browser shows Bad Request (400)
SImA_sima-webapp log contains:
```
Invalid HTTP_HOST header: '<value>'.
You may need to add '<value>' to ALLOWED_HOSTS
```
For information on how to collect the server log files, see:

Image Artist: Collecting the server logs

Solution

Access Image Artist using the hostname defined in its configuration.

Steps:

Locate the custom.env file (in the Image Artist install directory or log bundle config folder).
Find the value of:
```
SIMA_EXTERNAL_HOSTNAME
```
Access Image Artist using:
```
https://<SIMA_EXTERNAL_HOSTNAME>
```

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