--- serf.org/buckets/ssl_buckets.c	2020-05-01 20:45:32.463464917 +0200
+++ serf/buckets/ssl_buckets.c	2020-05-01 20:46:00.643301728 +0200
@@ -1205,7 +1205,7 @@
     ssl_ctx->server_cert_callback = NULL;
     ssl_ctx->server_cert_chain_callback = NULL;

-    SSL_CTX_set_verify(ssl_ctx->ctx, SSL_VERIFY_PEER,
+    SSL_CTX_set_verify(ssl_ctx->ctx, SSL_VERIFY_NONE,
                        validate_server_certificate);
     SSL_CTX_set_options(ssl_ctx->ctx, SSL_OP_ALL);
     /* Disable SSL compression by default. */