curle_setopt_option_syntax
Easy Fix
cURL · libcurl & CLI
libcurl code CURLE_SETOPT_OPTION_SYNTAX indicates setopt option syntax during libcurl option/runtime call sequencing.
Quick Answer
Error code CURLE_SETOPT_OPTION_SYNTAX on your cURL libcurl & CLI means: libcurl code CURLE_SETOPT_OPTION_SYNTAX indicates setopt option syntax during libcurl option/runtime call sequencing.. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Capture verbose output (-v / --trace) and isolate the exact phase where CURLE_SETOPT_OPTION_SYNTAX appears.
2
Reproduce setopt_option_syntax with a minimal request against a known-good endpoint.
3
Validate protocol, TLS, DNS, proxy, and timeout options tied to libcurl option/runtime call sequencing.
4
Adjust one option at a time until CURLE_SETOPT_OPTION_SYNTAX clears and transfer completes successfully.
5
Lock the fix into scripts/clients and monitor for CURLE_SETOPT_OPTION_SYNTAX regression.
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Related Error Codes