diff --git a/crates/ruma-client-api/src/media/create_content.rs b/crates/ruma-client-api/src/media/create_content.rs
index 4f984d23..b8314d08 100644
--- a/crates/ruma-client-api/src/media/create_content.rs
+++ b/crates/ruma-client-api/src/media/create_content.rs
@@ -5,6 +5,7 @@ pub mod v3 {
     //!
     //! [spec]: https://spec.matrix.org/v1.2/client-server-api/#post_matrixmediav3upload
 
+    use http::header::CONTENT_TYPE;
     use ruma_common::{api::ruma_api, OwnedMxcUri};
 
     ruma_api! {
diff --git a/crates/ruma-client-api/src/media/get_content.rs b/crates/ruma-client-api/src/media/get_content.rs
index d5c2f20b..f1dab5f5 100644
--- a/crates/ruma-client-api/src/media/get_content.rs
+++ b/crates/ruma-client-api/src/media/get_content.rs
@@ -5,6 +5,7 @@ pub mod v3 {
     //!
     //! [spec]: https://spec.matrix.org/v1.2/client-server-api/#get_matrixmediav3downloadservernamemediaid
 
+    use http::header::{CONTENT_DISPOSITION, CONTENT_TYPE};
     #[cfg(feature = "unstable-msc2246")]
     use js_int::UInt;
     use ruma_common::{api::ruma_api, IdParseError, MxcUri, ServerName};
diff --git a/crates/ruma-client-api/src/media/get_content_as_filename.rs b/crates/ruma-client-api/src/media/get_content_as_filename.rs
index 12c81782..93011caa 100644
--- a/crates/ruma-client-api/src/media/get_content_as_filename.rs
+++ b/crates/ruma-client-api/src/media/get_content_as_filename.rs
@@ -5,6 +5,7 @@ pub mod v3 {
     //!
     //! [spec]: https://spec.matrix.org/v1.2/client-server-api/#get_matrixmediav3downloadservernamemediaidfilename
 
+    use http::header::{CONTENT_DISPOSITION, CONTENT_TYPE};
     use ruma_common::{api::ruma_api, IdParseError, MxcUri, ServerName};
 
     ruma_api! {
diff --git a/crates/ruma-client-api/src/media/get_content_thumbnail.rs b/crates/ruma-client-api/src/media/get_content_thumbnail.rs
index f1819b57..b39545ec 100644
--- a/crates/ruma-client-api/src/media/get_content_thumbnail.rs
+++ b/crates/ruma-client-api/src/media/get_content_thumbnail.rs
@@ -5,6 +5,7 @@ pub mod v3 {
     //!
     //! [spec]: https://spec.matrix.org/v1.2/client-server-api/#get_matrixmediav3thumbnailservernamemediaid
 
+    use http::header::CONTENT_TYPE;
     use js_int::UInt;
     use ruma_common::{api::ruma_api, serde::StringEnum, IdParseError, MxcUri, ServerName};
 
diff --git a/crates/ruma-client-api/src/session/sso_login.rs b/crates/ruma-client-api/src/session/sso_login.rs
index dff3492e..968f18bd 100644
--- a/crates/ruma-client-api/src/session/sso_login.rs
+++ b/crates/ruma-client-api/src/session/sso_login.rs
@@ -5,6 +5,7 @@ pub mod v3 {
     //!
     //! [spec]: https://spec.matrix.org/v1.2/client-server-api/#get_matrixclientv3loginssoredirect
 
+    use http::header::LOCATION;
     use ruma_common::api::ruma_api;
 
     ruma_api! {
diff --git a/crates/ruma-client-api/src/session/sso_login_with_provider.rs b/crates/ruma-client-api/src/session/sso_login_with_provider.rs
index ce25c006..4fb1509f 100644
--- a/crates/ruma-client-api/src/session/sso_login_with_provider.rs
+++ b/crates/ruma-client-api/src/session/sso_login_with_provider.rs
@@ -7,6 +7,7 @@ pub mod v3 {
     //!
     //! [spec]: https://spec.matrix.org/v1.2/client-server-api/#get_matrixclientv3loginssoredirectidpid
 
+    use http::header::LOCATION;
     use ruma_common::api::ruma_api;
 
     ruma_api! {
diff --git a/crates/ruma-client-api/src/uiaa/get_uiaa_fallback_page.rs b/crates/ruma-client-api/src/uiaa/get_uiaa_fallback_page.rs
index d56343a2..95636d3a 100644
--- a/crates/ruma-client-api/src/uiaa/get_uiaa_fallback_page.rs
+++ b/crates/ruma-client-api/src/uiaa/get_uiaa_fallback_page.rs
@@ -5,6 +5,7 @@ pub mod v3 {
     //!
     //! [spec]: https://spec.matrix.org/v1.2/client-server-api/#fallback
 
+    use http::header::LOCATION;
     use ruma_common::api::ruma_api;
 
     ruma_api! {
diff --git a/crates/ruma-client-api/src/user_directory/search_users.rs b/crates/ruma-client-api/src/user_directory/search_users.rs
index afcaf61f..92f14579 100644
--- a/crates/ruma-client-api/src/user_directory/search_users.rs
+++ b/crates/ruma-client-api/src/user_directory/search_users.rs
@@ -5,6 +5,7 @@ pub mod v3 {
     //!
     //! [spec]: https://spec.matrix.org/v1.2/client-server-api/#post_matrixclientv3user_directorysearch
 
+    use http::header::ACCEPT_LANGUAGE;
     use js_int::{uint, UInt};
     use ruma_common::{api::ruma_api, OwnedMxcUri, OwnedUserId};
     use serde::{Deserialize, Serialize};
diff --git a/crates/ruma-common/CHANGELOG.md b/crates/ruma-common/CHANGELOG.md
index 65f05b59..7d8c83f6 100644
--- a/crates/ruma-common/CHANGELOG.md
+++ b/crates/ruma-common/CHANGELOG.md
@@ -6,6 +6,10 @@ Breaking changes:
 * Remove deprecated constructors for `RoomMessageEventContent`
 * Remove `serde::vec_as_map_of_empty` from the public API
 * Remove the `api::AuthScheme::QueryOnlyAccessToken` variant, which is no longer used
+* The `#[ruma_api(header)]` attribute of the `ruma_api` macro now accepts an arbitrary
+  `http::header::HeaderName`
+  * To continue using constants from `http::header`, they must be imported in
+    the module calling the macro.
 
 Improvements:
 
diff --git a/crates/ruma-common/src/api.rs b/crates/ruma-common/src/api.rs
index bc7f9084..c04e8fe7 100644
--- a/crates/ruma-common/src/api.rs
+++ b/crates/ruma-common/src/api.rs
@@ -78,8 +78,9 @@ use crate::UserId;
 ///
 /// * `#[ruma_api(header = HEADER_NAME)]`: Fields with this attribute will be treated as HTTP
 ///   headers on the request. The value must implement `AsRef<str>`. Generally this is a
-///   `String`. The attribute value shown above as `HEADER_NAME` must be a header name constant
-///   from `http::header`, e.g. `CONTENT_TYPE`.
+///   `String`. The attribute value shown above as `HEADER_NAME` must be a `const` expression
+///   of the type `http::header::HeaderName`, like one of the constants from `http::header`,
+///   e.g. `CONTENT_TYPE`.
 /// * `#[ruma_api(path)]`: Fields with this attribute will be inserted into the matching path
 ///   component of the request URL.
 /// * `#[ruma_api(query)]`: Fields with this attribute will be inserting into the URL's query
@@ -123,6 +124,7 @@ use crate::UserId;
 ///
 /// ```
 /// pub mod some_endpoint {
+///     use http::header::CONTENT_TYPE;
 ///     use ruma_common::api::ruma_api;
 ///
 ///     ruma_api! {
diff --git a/crates/ruma-common/tests/api/conversions.rs b/crates/ruma-common/tests/api/conversions.rs
index d86ec7bc..eba71b40 100644
--- a/crates/ruma-common/tests/api/conversions.rs
+++ b/crates/ruma-common/tests/api/conversions.rs
@@ -1,5 +1,6 @@
 #![allow(clippy::exhaustive_structs)]
 
+use http::header::CONTENT_TYPE;
 use ruma_common::{
     api::{
         ruma_api, IncomingRequest as _, MatrixVersion, OutgoingRequest as _,
@@ -121,7 +122,7 @@ fn request_with_user_id_serde() {
 mod without_query {
     use ruma_common::{api::MatrixVersion, OwnedUserId};
 
-    use super::{ruma_api, user_id, OutgoingRequestAppserviceExt, SendAccessToken};
+    use super::{ruma_api, user_id, OutgoingRequestAppserviceExt, SendAccessToken, CONTENT_TYPE};
 
     ruma_api! {
         metadata: {
diff --git a/crates/ruma-common/tests/api/header_override.rs b/crates/ruma-common/tests/api/header_override.rs
index f3dc0d28..f80a6f33 100644
--- a/crates/ruma-common/tests/api/header_override.rs
+++ b/crates/ruma-common/tests/api/header_override.rs
@@ -1,6 +1,6 @@
 #![allow(clippy::exhaustive_structs)]
 
-use http::header::{Entry, CONTENT_TYPE};
+use http::header::{Entry, CONTENT_TYPE, LOCATION};
 use ruma_common::api::{
     ruma_api, MatrixVersion, OutgoingRequest as _, OutgoingResponse as _, SendAccessToken,
 };
diff --git a/crates/ruma-common/tests/api/optional_headers.rs b/crates/ruma-common/tests/api/optional_headers.rs
index 28e1cea8..d94193b8 100644
--- a/crates/ruma-common/tests/api/optional_headers.rs
+++ b/crates/ruma-common/tests/api/optional_headers.rs
@@ -1,3 +1,4 @@
+use http::header::LOCATION;
 use ruma_common::api::ruma_api;
 
 ruma_api! {
diff --git a/crates/ruma-common/tests/api/ruma_api_lifetime.rs b/crates/ruma-common/tests/api/ruma_api_lifetime.rs
index ba570382..990d442b 100644
--- a/crates/ruma-common/tests/api/ruma_api_lifetime.rs
+++ b/crates/ruma-common/tests/api/ruma_api_lifetime.rs
@@ -58,6 +58,7 @@ mod nested_types {
 }
 
 mod full_request_response {
+    use http::header::CONTENT_TYPE;
     use ruma_common::api::ruma_api;
 
     use super::{IncomingOtherThing, OtherThing};
@@ -92,6 +93,7 @@ mod full_request_response {
 }
 
 mod full_request_response_with_query_map {
+    use http::header::CONTENT_TYPE;
     use ruma_common::api::ruma_api;
 
     ruma_api! {
diff --git a/crates/ruma-common/tests/api/ruma_api_macros.rs b/crates/ruma-common/tests/api/ruma_api_macros.rs
index 441017e8..ce577bf4 100644
--- a/crates/ruma-common/tests/api/ruma_api_macros.rs
+++ b/crates/ruma-common/tests/api/ruma_api_macros.rs
@@ -1,6 +1,7 @@
 #![allow(clippy::exhaustive_structs)]
 
 pub mod some_endpoint {
+    use http::header::CONTENT_TYPE;
     use ruma_common::{
         api::ruma_api,
         events::{tag::TagEvent, AnyTimelineEvent},
diff --git a/crates/ruma-macros/src/api/request/incoming.rs b/crates/ruma-macros/src/api/request/incoming.rs
index 5c406bdf..71a56c8d 100644
--- a/crates/ruma-macros/src/api/request/incoming.rs
+++ b/crates/ruma-macros/src/api/request/incoming.rs
@@ -113,7 +113,7 @@ impl Request {
 
                     let decl = quote! {
                         #( #cfg_attrs )*
-                        let #field_name = match headers.get(#http::header::#header_name) {
+                        let #field_name = match headers.get(#header_name) {
                             Some(header_value) => {
                                 let str_value = header_value.to_str()?;
                                 #some_case
diff --git a/crates/ruma-macros/src/api/request/outgoing.rs b/crates/ruma-macros/src/api/request/outgoing.rs
index 138017c2..6b89c2f2 100644
--- a/crates/ruma-macros/src/api/request/outgoing.rs
+++ b/crates/ruma-macros/src/api/request/outgoing.rs
@@ -88,7 +88,7 @@ impl Request {
                     quote! {
                         if let Some(header_val) = self.#field_name.as_ref() {
                             req_headers.insert(
-                                #http::header::#header_name,
+                                #header_name,
                                 #http::header::HeaderValue::from_str(header_val)?,
                             );
                         }
@@ -96,7 +96,7 @@ impl Request {
                 }
                 _ => quote! {
                     req_headers.insert(
-                        #http::header::#header_name,
+                        #header_name,
                         #http::header::HeaderValue::from_str(self.#field_name.as_ref())?,
                     );
                 },
diff --git a/crates/ruma-macros/src/api/response/incoming.rs b/crates/ruma-macros/src/api/response/incoming.rs
index 4641ea6b..59260c53 100644
--- a/crates/ruma-macros/src/api/response/incoming.rs
+++ b/crates/ruma-macros/src/api/response/incoming.rs
@@ -60,7 +60,7 @@ impl Response {
                                 quote! {
                                     #( #cfg_attrs )*
                                     #field_name: {
-                                        headers.remove(#http::header::#header_name)
+                                        headers.remove(#header_name)
                                             .map(|h| h.to_str().map(|s| s.to_owned()))
                                             .transpose()?
                                     }
@@ -69,7 +69,7 @@ impl Response {
                             _ => quote! {
                                 #( #cfg_attrs )*
                                 #field_name: {
-                                    headers.remove(#http::header::#header_name)
+                                    headers.remove(#header_name)
                                         .expect("response missing expected header")
                                         .to_str()?
                                         .to_owned()
diff --git a/crates/ruma-macros/src/api/response/outgoing.rs b/crates/ruma-macros/src/api/response/outgoing.rs
index 5ddb3d26..4ce9bb62 100644
--- a/crates/ruma-macros/src/api/response/outgoing.rs
+++ b/crates/ruma-macros/src/api/response/outgoing.rs
@@ -20,7 +20,7 @@ impl Response {
                         quote! {
                             if let Some(header) = self.#field_name {
                                 headers.insert(
-                                    #http::header::#header_name,
+                                    #header_name,
                                     header.parse()?,
                                 );
                             }
@@ -28,7 +28,7 @@ impl Response {
                     }
                     _ => quote! {
                         headers.insert(
-                            #http::header::#header_name,
+                            #header_name,
                             self.#field_name.parse()?,
                         );
                     },