A process server attempted to slap an ex-cop accused of sex assault with court papers during ​his Brooklyn Supreme Court proceeding Thursday, but was tossed from the courtroom.

The unnamed ​affidavit-​server literally poked former Special Narcotics Det. Richard Hall with the lawsuit as he sat in the gallery​ ​–​ ​reaching over his co-defendant, ​ex-partner Eddie Martins​ ​–​ ​before the frustrated man dropped the docs in Hall’s lap.

“That’s illegal,” Hall’s attorney, Peter Guadagnino spat, snatching the papers off his client’s lap and handing them to a ​court officer, who had the server tossed into the courthouse hallway.

It’s illegal to serve someone with a lawsuit inside a courtroom in New York City. The rest of the courthouse is up for grabs.

The server declined to tell The Post who was behind the ​legal ​action.

A Brooklyn teen who goes by the ​pseudonym Anna Chambers has accused Hall and Martins of raping and sexually assaulting her while she was handcuffed in the back of their police van in Sept. 2017.

Chambers, now 19, sat in the back of the gallery Thursday, as Judge Danny Chun ordered that 800 pages of deposition testimony she gave in connection with her pending lawsuit against the city and the men be unsealed.

All parties were ordered to return to court Sept. 6 to pick a trial date.

Following Thursday’s proceeding, Guadagnino denounced the process server’s attempt to get at his client in court.

“He should be served at home, or a place of business,” the attorney groused.