feat: allow http calls without origin header (tauri-apps#1941)

Author: Nipsuli

.changes/http-allow-skip-origin.md

@@ -0,0 +1,6 @@
+---
+"http": "patch"
+"http-js": "patch"
+---
+
+Allow skipping sending `Origin` header in HTTP requests by setting `Origin` header to an empty string when calling `fetch`.

plugins/http/src/commands.rs

@@ -264,6 +264,14 @@ pub async fn fetch<R: Runtime>(
                     }
                 }
 
+                // In case empty origin is passed, remove it. Some services do not like Origin header
+                // so this way we can remove it in explicit way. The default behaviour is still to set it
+                if cfg!(feature = "unsafe-headers")
+                    && headers.get(header::ORIGIN) == Some(&HeaderValue::from_static(""))
+                {
+                    headers.remove(header::ORIGIN);
+                };
+
                 if let Some(data) = data {
                     request = request.body(data);
                 }