Section: Debugging and Diagnostics

Force IPv4

bash
bash
curl -4 https://example.com
Explanation

Helpful for troubleshooting mixed IPv4/IPv6 environments.

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Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Related commands

Same sheet · prioritizing Debugging and Diagnostics
Limit connect time
Fail if the connection cannot be established quickly.
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Use an HTTP proxy
Send requests through an HTTP proxy.
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Force IPv6
Resolve and connect using IPv6 only.
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Limit total transfer time
Abort the request after a fixed total duration.
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Override DNS resolution
Map a hostname and port to a specific IP address.
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Redirect one host:port to another
Change where curl connects without changing the URL's host name.
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