get error to add specific feed[BUG]
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Feed problem :newspaper_roll:
- Dominant language
- PHP
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Description
**Describe the bug**
when i try add [this feed](https://protesilaos.com/master.xml) freshrss show me an error. feed pass error validation
**To Reproduce**
add this feed to your feed
**Expected behavior**
pass without error or at least more clear error
**Environment information (please complete the following information):**
- OS: Debian 10
- FreshRSS version: 1.19.1
- Database version: sqlite
- PHP version: 7.4.25
- Installation type: docker
**Additional context**
log content
```
A feed could not be found at `https://protesilaos.com/master.xml`; the status code is `200` and content-type is `` [https://protesilaos.com/master.xml]
Unknown error for feed [https://protesilaos.com/master.xml]
```
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