Solli had three assists in the 4-0 romp, in which Henry struck twice.
"Jan Gunnar was more than active on the right hand side," Henry told the New York Post.
"He created a lot for us tonight. Teemu [Tainio] was Teemu. He's going to fight and give 100 percent,'' said Henry. "But overall I think we had to defend well tonight even though [D.C. United] created some chances. They hit the crossbar, they hit the post, and Bouna had a couple of saves, but we didn't concede a goal and that's what is important.''