Coupang does not support TLS v1.0, v1.1 due to security risks.

Therefore, if you receive the following error message when calling openapi, you need to upgrade the TLS version.

javax.net.ssl.SSLException: Received fatal alert: protocol_version

 

Java

Default protocol version by java version

Java Version	SSL/TLS Default	Other Supported Versions
Java 6	TLS 1.0	TLS 1.1 (update 111 and later), SSLv3.0*
Java 7	TLS 1.0	TLS 1.2, TLS 1.1, SSLv3.0*
Java 8	TLS 1.2	TLS 1.1, TLS 1.0, SSLv3.0*

* SSLv3 support disabled in January, 2015 patch releases

※ Reference :

https://www.baeldung.com/java-7-tls-v12

http://www.ateam-oracle.com/tls-and-java/

 

Therefore, if you are using java 6, you must upgrade to java 7 or higher.

 

Application Server setting

Restart after adding the following command to the JAVA HOME directory setting in the server startup options or the location where the -D option is set.

-Dhttps.protocols=TLSv1.2 -Djdk.tls.client.protocols=TLSv1.2