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This one works like a charm, specially when using curl between Docker containers. I use it like this in PHP: exec("curl -LI "my service name"/"the file I'm looking the HTTP code for" -o /dev/null -w '%{http_code}\n' -s") (e.g.: exec("curl -LI static/someimage.jpg -o [...] where "static" is the service name defined in Docker Compose). Thanks!
– Jimmy Adaro
Commented Aug 19, 2021 at 20:28
I would get rid of the -I so it does a normal GET instead of a HEAD request.
– PolyTekPatrick
Commented Mar 9, 2023 at 18:32

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create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
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indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
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[example](https://example.com)
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