SSL error hitting an API

I’m writing a scheduled worker that will hit the Marvel API ( at When I run my scheduled task locally, I’m getting:

workerd/util/symbolizer.c++:99: warning: Not symbolizing stack traces because $LLVM_SYMBOLIZER is not set. To symbolize stack traces, set $LLVM_SYMBOLIZER to the location of the llvm-symbolizer binary. When running tests under bazel, use `--test_env=LLVM_SYMBOLIZER=<path>`.
workerd/jsg/util.c++:275: error: e = kj/compat/tls.c++:74: failed: OpenSSL error; message = error:10000410:SSL routines:OPENSSL_internal:SSLV3_ALERT_HANDSHAKE_FAILURE
error:1000009a:SSL routines:OPENSSL_internal:HANDSHAKE_FAILURE_ON_CLIENT_HELLO

I’ve tried the same code outside of Cloudflare, in a simple Node.js script, and it connects just fine.