diff --git a/server-rs/crates/api-server/src/raw_image.rs b/server-rs/crates/api-server/src/raw_image.rs
index e7bb2ff53..106698345 100644
--- a/server-rs/crates/api-server/src/raw_image.rs
+++ b/server-rs/crates/api-server/src/raw_image.rs
@@ -278,7 +278,17 @@ async fn read_multipart_image(
     name: &str,
     total_bytes: &mut usize,
 ) -> Result<RawImageData, AppError> {
-    let mime_type = field.content_type().unwrap_or_default().to_string();
+    let mime_type = field
+        .content_type()
+        .map(|value| {
+            value
+                .split(';')
+                .next()
+                .unwrap_or_default()
+                .trim()
+                .to_string()
+        })
+        .unwrap_or_default();
     if !mime_type.eq_ignore_ascii_case("image/png") {
         return Err(bad_request(format!("{name} 必须为 image/png")));
     }