# Fixing 400 HTTP errors when using HTTP instead of HTTPS
## Introduction
When using HTTP -> HTTPS redirect on your Supervisely instance, you may face the problem, when all Supervisely applications would crash with same error, which in most cases, look like this in app's logs:
```
400 Client Error: Bad Request for url: https://your-sly-instance-domain/public/api/v3/ecosystem.file.download
```
Full log entry for example:
```json
{
"level": "warn",
"message": "TASK_END",
"fields": {
"exit_status": "400 Client Error: Bad Request for url: https://your-sly-instance-domain/api/v3/ecosystem.file.download ({\"error\":\"Validation error\",\"details\":[{\"message\":\"\\\"moduleId\\\" is required\",\"path\":[\"moduleId\"],\"type\":\"any.required\",\"context\":{\"key\":\"moduleId\",\"label\":\"moduleId\"}},{\"message\":\"\\\"value\\\" must contain at least one of [filePath, isArchive]\",\"path\":[],\"type\":\"object.missing\",\"context\":{\"peers\":[\"filePath\",\"isArchive\"],\"peersWithLabels\":[\"filePath\",\"isArchive\"],\"label\":\"value\"}}]})"
},
"timestamp": "2023-10-04T08:12:42.922Z",
"task_id": 79
}
```
So, to fix this error, you just need to change http\:// part of server address to https\:// in instance's settings.\
And there are two ways to do it:
1. [Using UI](#changing-server-address-using-ui)
2. [Using terminal](#changing-server-address-using-terminal)
## Changing Server Address Using UI
1. Log in into your Supervisely instance as admin user.
2. In top right corner, click on your user name and select `Instance settings` from dropdown menu.
3. Expand `Server configuration` section.
4. In `Server address` field, change `http://` part of server address to `https://` (e.g. `http://your-sly-instance-domain` -> `https://your-sly-instance-domain`).
5. Scroll the page down and click `Save` button.
ℹ️ After changing the server address you need to re-deploy all agents, which are connected to your instance.
## Changing Server Address Using Terminal
1. Open Supervisely directory in terminal (e.g. `cd /home/supervisely/supervisely`).
2. Open `.env` file in your favorite text editor (e.g. `nano .env`).
3. Find `DOMAIN` variable and change `http://` part of server address to `https://` (e.g. `http://your-sly-instance-domain` -> `https://your-sly-instance-domain`).
4. Repeat the same for `SERVER_ADDRESS` variable.
5. Save changes and close the file.
6. Restart Supervisely using `sudo supervisely up -d` command, otherwise changes won't take effect.
[](https://asciinema.org/a/bJsPCmcOw4pkxw0FdQGhq1JsO)
ℹ️ After changing the server address you need to re-deploy all agents, which are connected to your instance.
---
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