support delete via GET

docs/publish.md

@@ -2777,16 +2777,20 @@ Here's an example of a dead man's switch that sends an alert if the script stops
 ### Canceling scheduled notifications
 
 You can cancel a scheduled message before it is delivered by sending a DELETE request to the 
-`/<topic>/<sequence_id>` endpoint, just like [deleting notifications](#deleting-notifications). This will remove the 
+`/<topic>/<sequence_id>` endpoint, just like [deleting notifications](#deleting-notifications). Alternatively, you can send a `GET`
-scheduled message from the server so it will never be delivered, and emit a `message_delete` event to any subscribers.
+request to `/<topic>/<sequence_id>/delete`. This will remove the scheduled message from the server so it will never be delivered,
+and emit a `message_delete` event to any subscribers.
 
 === "Command line (curl)"
     ```bash
     # Schedule a reminder for 2 hours from now
     curl -H "In: 2h" -d "Take a break!" ntfy.sh/mytopic/break-reminder
 
-    # Changed your mind? Cancel the scheduled message
+    # Changed your mind? Cancel the scheduled message via DELETE
     curl -X DELETE ntfy.sh/mytopic/break-reminder
+
+    # Or cancel it via GET
+    curl ntfy.sh/mytopic/break-reminder/delete
     ```
 
 === "ntfy CLI"
@@ -4154,25 +4158,40 @@ An example response from the server with the `message_clear` event may look like
 ### Deleting notifications
 Deleting a notification means **removing it from the notification drawer and from the client's database**.
 
-To do this, send a DELETE request to the `/<topic>/<sequence_id>` endpoint. This will emit a `message_delete` event
+To do this, send a `DELETE` request to the `/<topic>/<sequence_id>` endpoint. This will emit a `message_delete` event
 that is used by the clients (web app and Android app) to remove the notification entirely.
 
+Alternatively, if your client has limited HTTP support (e.g. webhooks or IoT devices), you can also delete a message by sending
+a `GET` request to `/<topic>/<sequence_id>/delete`.
+
 === "Command line (curl)"
     ```bash
+    # Via DELETE method
     curl -X DELETE ntfy.sh/mytopic/my-download-123
+
+    # Via GET method
+    curl ntfy.sh/mytopic/my-download-123/delete
     ```
 
 === "HTTP"
     ``` http
     DELETE /mytopic/my-download-123 HTTP/1.1
     Host: ntfy.sh
+
+    # Or using GET
+    GET /mytopic/my-download-123/delete HTTP/1.1
+    Host: ntfy.sh
     ```
 
 === "JavaScript"
     ``` javascript
+    // Via DELETE method
     await fetch('https://ntfy.sh/mytopic/my-download-123', {
       method: 'DELETE'
     });
+
+    // Via GET method
+    await fetch('https://ntfy.sh/mytopic/my-download-123/delete');
     ```
 
 === "Go"

server/server.go

@@ -91,6 +91,7 @@ var (
 	publishPathRegex       = regexp.MustCompile(`^/[-_A-Za-z0-9]{1,64}/(publish|send|trigger)$`)
 	updatePathRegex        = regexp.MustCompile(`^/[-_A-Za-z0-9]{1,64}/[-_A-Za-z0-9]{1,64}$`)
 	clearPathRegex         = regexp.MustCompile(`^/[-_A-Za-z0-9]{1,64}/[-_A-Za-z0-9]{1,64}/(read|clear)$`)
+	deletePathRegex        = regexp.MustCompile(`^/[-_A-Za-z0-9]{1,64}/[-_A-Za-z0-9]{1,64}/delete$`)
 	sequenceIDRegex        = topicRegex
 
 	webConfigPath                                        = "/config.js"
@@ -645,6 +646,8 @@ func (s *Server) handleInternal(w http.ResponseWriter, r *http.Request, v *visit
 		return s.limitRequestsWithTopic(s.authorizeTopicWrite(s.handlePublish))(w, r, v)
 	} else if r.Method == http.MethodDelete && updatePathRegex.MatchString(r.URL.Path) {
 		return s.limitRequestsWithTopic(s.authorizeTopicWrite(s.handleDelete))(w, r, v)
+	} else if r.Method == http.MethodGet && deletePathRegex.MatchString(r.URL.Path) {
+		return s.limitRequestsWithTopic(s.authorizeTopicWrite(s.handleDelete))(w, r, v)
 	} else if r.Method == http.MethodPut && clearPathRegex.MatchString(r.URL.Path) {
 		return s.limitRequestsWithTopic(s.authorizeTopicWrite(s.handleClear))(w, r, v)
 	} else if r.Method == http.MethodGet && publishPathRegex.MatchString(r.URL.Path) {

server/server_test.go

@@ -4026,6 +4026,40 @@ func TestServer_DeleteMessage(t *testing.T) {
 	})
 }
 
+func TestServer_DeleteMessage_GET(t *testing.T) {
+	forEachBackend(t, func(t *testing.T, databaseURL string) {
+		t.Parallel()
+		s := newTestServer(t, newTestConfig(t, databaseURL))
+
+		// Publish a message with a sequence ID
+		response := request(t, s, "PUT", "/mytopic/seq123", "original message", nil)
+		require.Equal(t, 200, response.Code)
+		msg := toMessage(t, response.Body.String())
+		require.Equal(t, "seq123", msg.SequenceID)
+		require.Equal(t, "message", msg.Event)
+
+		// Delete the message using GET method (/topic/seq/delete)
+		response = request(t, s, "GET", "/mytopic/seq123/delete", "", nil)
+		require.Equal(t, 200, response.Code)
+		deleteMsg := toMessage(t, response.Body.String())
+		require.Equal(t, "seq123", deleteMsg.SequenceID)
+		require.Equal(t, "message_delete", deleteMsg.Event)
+
+		// Poll and verify both messages are returned
+		response = request(t, s, "GET", "/mytopic/json?poll=1", "", nil)
+		require.Equal(t, 200, response.Code)
+		lines := strings.Split(strings.TrimSpace(response.Body.String()), "\n")
+		require.Equal(t, 2, len(lines))
+
+		msg1 := toMessage(t, lines[0])
+		msg2 := toMessage(t, lines[1])
+		require.Equal(t, "message", msg1.Event)
+		require.Equal(t, "message_delete", msg2.Event)
+		require.Equal(t, "seq123", msg1.SequenceID)
+		require.Equal(t, "seq123", msg2.SequenceID)
+	})
+}
+
 func TestServer_ClearMessage(t *testing.T) {
 	forEachBackend(t, func(t *testing.T, databaseURL string) {
 		t.Parallel()
@@ -4286,6 +4320,41 @@ func TestServer_DeleteScheduledMessage(t *testing.T) {
 	})
 }
 
+func TestServer_DeleteScheduledMessage_GET(t *testing.T) {
+	forEachBackend(t, func(t *testing.T, databaseURL string) {
+		t.Parallel()
+		s := newTestServer(t, newTestConfig(t, databaseURL))
+
+		// Publish a scheduled message (future delivery)
+		response := request(t, s, "PUT", "/mytopic/delete-sched-seq?delay=1h", "scheduled message to delete", nil)
+		require.Equal(t, 200, response.Code)
+		msg := toMessage(t, response.Body.String())
+		require.Equal(t, "delete-sched-seq", msg.SequenceID)
+
+		// Verify scheduled message exists
+		response = request(t, s, "GET", "/mytopic/json?poll=1&scheduled=1", "", nil)
+		require.Equal(t, 200, response.Code)
+		messages := toMessages(t, response.Body.String())
+		require.Equal(t, 1, len(messages))
+		require.Equal(t, "scheduled message to delete", messages[0].Message)
+
+		// Delete the scheduled message using GET method (/topic/seq/delete)
+		response = request(t, s, "GET", "/mytopic/delete-sched-seq/delete", "", nil)
+		require.Equal(t, 200, response.Code)
+		deleteMsg := toMessage(t, response.Body.String())
+		require.Equal(t, "delete-sched-seq", deleteMsg.SequenceID)
+		require.Equal(t, "message_delete", deleteMsg.Event)
+
+		// Verify scheduled message was deleted, only delete event remains
+		response = request(t, s, "GET", "/mytopic/json?poll=1&scheduled=1", "", nil)
+		require.Equal(t, 200, response.Code)
+		messages = toMessages(t, response.Body.String())
+		require.Equal(t, 1, len(messages))
+		require.Equal(t, "message_delete", messages[0].Event)
+		require.Equal(t, "delete-sched-seq", messages[0].SequenceID)
+	})
+}
+
 func TestServer_UpdateScheduledMessage_TopicScoped(t *testing.T) {
 	forEachBackend(t, func(t *testing.T, databaseURL string) {
 		t.Parallel()