Merge commit '43726783e' into dinsic

* commit '43726783e': (22 commits)
  1.17.0rc1
  Fix some spelling mistakes / typos. (#7811)
  `update_membership` declaration: now always returns an event id. (#7809)
  Improve stacktraces from exceptions in background processes (#7808)
  Fix `can only concatenate list (not "tuple") to list` exception (#7810)
  Pass original request headers from workers to the main process. (#7797)
  Generate real events when we reject invites (#7804)
  Add `HomeServer.signing_key` property (#7805)
  Revert "Update the installation docs on apt-transport-https (#7801)"
  Do not use simplejson in Synapse. (#7800)
  Stop passing bytes when dumping JSON (#7799)
  Update the installation docs on apt-transport-https (#7801)
  shuffle changelog slightly
  Change Caddy links (old is deprecated) (#7789)
  Stop populating unused table `local_invites`. (#7793)
  Refactor getting replication updates from database v2. (#7740)
  Add libwebp dependency to Dockerfile (#7791)
  Add documentation for JWT login type and improve sample config. (#7776)
  Convert the appservice handler to async/await. (#7775)
  Don't ignore `set_tweak` actions with no explicit `value`. (#7766)
  ...

1 files changed, 2 insertions, 2 deletions

diff --git a/synapse/handlers/identity.py b/synapse/handlers/identity.py
index a77088e295..88537a5be3 100644
--- a/synapse/handlers/identity.py
+++ b/synapse/handlers/identity.py
@@ -268,10 +268,10 @@ class IdentityHandler(BaseHandler):
         url_bytes = "/_matrix/identity/api/v1/3pid/unbind".encode("ascii")
         auth_headers = self.federation_http_client.build_auth_headers(
             destination=None,
-            method="POST",
+            method=b"POST",
             url_bytes=url_bytes,
             content=content,
-            destination_is=id_server,
+            destination_is=id_server.encode("ascii"),
         )
         headers = {b"Authorization": auth_headers}