How to evaluate http response codes from bash/shell script?

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I haven’t tested this on a 500 code, but it works on others like 200, 302 and 404.

response=$(curl --write-out '%{http_code}' --silent --output /dev/null servername)

Note, format provided for –write-out should be quoted.
As suggested by @ibai, add --head to make a HEAD only request. This will save time when the retrieval is successful since the page contents won’t be transmitted.

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