Can a state prisoner appeal a district court's denial of a habeas petition?

Under AEDPA, a state prisoner seeking to appeal a district court's denial of a habeas petition must obtain a certificate of appealability from the district court judge or a circuit judge. 28 U.S.C. 2253(c)(1)(A). A court may issue a certificate of appealability only if the applicant has made "a substantial showing of the denial of a constitutional right." 28 U.S.C. 2253(c)(2). To satisfy this standard, the petitioner must show that "reasonable jurists would find the district court's assessment of the constitutional claims debatable or wrong." Slack v. McDaniel, 529 U.S. 473, 484

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