Is a federal prisoner required to obtain a certificate of appealability to appeal the denial of a petition pursuant to Section 2241 of the Criminal Code?

"The plain language of [28 U.S.C.] 2253(c)(1) does not require a petitioner to obtain a [certificate of appealability] in order to appeal the denial of a 2241 petition." Harrison v. Ollison, 519 F.3d 952, 958 (9th Cir. 2008). "Nor is there any other statutory basis for imposing a [certificate of appealability] requirement on legitimate 2241 petitions. Although state prisoners proceeding under 2241 must obtain a [certificate of appealability], see 2253(c)(1)(A), there is no parallel requirement for federal prisoners." Id.