fix: set Content-Length on presigned PUT uploads for S3 compatibility

packages/js-sdk/src/template/buildApi.ts

@@ -119,12 +119,21 @@ export async function uploadFile(
       resolveSymlinks
     )
 
-    // The compiler assumes this is Web fetch API, but it's actually Node.js fetch API
+    // Buffer the gzipped tar to determine Content-Length.
+    // S3 presigned PUT URLs do not support Transfer-Encoding: chunked,
+    // and the compressed size is unknowable without actually compressing.
+    const chunks: Buffer[] = []
+    for await (const chunk of uploadStream as unknown as AsyncIterable<Buffer>) {
+      chunks.push(chunk)
+    }
+    const body = Buffer.concat(chunks)
+
     const res = await fetch(url, {
       method: 'PUT',
-      // @ts-expect-error
-      body: uploadStream,
-      duplex: 'half',
+      body,
+      headers: {
+        'Content-Length': String(body.length),
+      },
     })
 
     if (!res.ok) {

packages/js-sdk/src/template/utils.ts

@@ -385,10 +385,11 @@ export async function tarFileStream(
 }
 
 /**
- * Create a tar stream for upload using chunked transfer encoding.
+ * Create a tar stream for upload.
  *
  * @param fileName Glob pattern for files to include
  * @param fileContextPath Base directory for resolving file paths
+ * @param ignorePatterns Ignore patterns to exclude from the archive
  * @param resolveSymlinks Whether to follow symbolic links
  * @returns A readable stream of the gzipped tar archive
  */

packages/python-sdk/e2b/template_async/build_api.py

@@ -111,8 +111,15 @@ async def upload_file(
             file_name, context_path, ignore_patterns, resolve_symlinks
         )
 
+        # Use bytes with explicit Content-Length.
+        # S3 presigned PUT URLs do not support Transfer-Encoding: chunked.
+        body = tar_buffer.getvalue()
         client = api_client.get_async_httpx_client()
-        response = await client.put(url, content=tar_buffer.getvalue())
+        response = await client.put(
+            url,
+            content=body,
+            headers={"Content-Length": str(len(body))},
+        )
         response.raise_for_status()
     except httpx.HTTPStatusError as e:
         raise FileUploadException(f"Failed to upload file: {e}").with_traceback(

packages/python-sdk/e2b/template_sync/build_api.py

@@ -110,8 +110,16 @@ def upload_file(
         tar_buffer = tar_file_stream(
             file_name, context_path, ignore_patterns, resolve_symlinks
         )
+
+        # Use bytes with explicit Content-Length.
+        # S3 presigned PUT URLs do not support Transfer-Encoding: chunked.
+        body = tar_buffer.getvalue()
         client = api_client.get_httpx_client()
-        response = client.put(url, content=tar_buffer.getvalue())
+        response = client.put(
+            url,
+            content=body,
+            headers={"Content-Length": str(len(body))},
+        )
         response.raise_for_status()
     except httpx.HTTPStatusError as e:
         raise FileUploadException(f"Failed to upload file: {e}").with_traceback(