JIRA: https://jira.spring.io/browse/INT-3740 For `File` and `String` payloads add `FileHeaders.ORIGINAL_FILE` and `FileHeaders.FILENAME` headers. Reworked to create headers once only. Fix typos and Java > 6 API usage
JIRA: https://jira.spring.io/browse/INT-3740 For `File` and `String` payloads add `FileHeaders.ORIGINAL_FILE` and `FileHeaders.FILENAME` headers. Reworked to create headers once only. Fix typos and Java > 6 API usage