New dependency and refactoring

- using httpmime (4.3.6) instead of httpcore (4.3.3) to avoid dependency
issues
- minor changes in the code

[maven-release-plugin] copy for tag java-wrapper-1.0.4

[maven-release-plugin] copy for tag java-wrapper-1.0.3

[maven-release-plugin] copy for tag java-wrapper-1.0.2

[maven-release-plugin] copy for tag java-wrapper-1.0.1

[maven-release-plugin] copy for tag java-wrapper-0.1.9

[maven-release-plugin] copy for tag java-wrapper-0.1.7

[maven-release-plugin] copy for tag java-wrapper-0.1.4