Used public key:
-----BEGIN PUBLIC KEY-----
MEwwDQYJKoZIhvcNAQEBBQADOwAwOAIxAMAyyOArE+BoIgN+pipyf5uki64O8Grs
5Kf6LrBo45Ik7KIlYhn8OJ+kzlz2dhYoDQIDAQAB
-----END PUBLIC KEY-----

You can use the query string to specify the data
Encrypted text: 1234567890123456789012345678901234567
Encrypted raw:
KN§L˘ì<Íqéq<•.a%½ æ;ÜQ~ùá¹XÆñãg£t¡‘ RÍ´

Encrypted base64 encoded:
CEuQTqdMy5jsPM1x6RZxPJUQLmElvSDmO41/3FF++eG5WMbx42ejdKGRHSBSHM20
This encryption uses OPENSSL_PKCS1_PADDING and a pre-defined key pair. By an key length of 384, the maximum data length is 37 characters (would be 48 without padding).