in aws-serverless-java-container-core/src/main/java/com/amazonaws/serverless/proxy/internal/servlet/AwsCookieProcessor.java [270:272]
private boolean isValidCookieChar(char c) {
return !(c < 0x21 || c > 0x7E || c == 0x22 || c == 0x2c || c == 0x3b || c == 0x5c);
}