[Frontend][3/n] Make pooling entrypoints request schema consensus | EmbedRequest & ClassifyRequest (#32905)

Signed-off-by: wang.yuqi <yuqi.wang@daocloud.io>
Signed-off-by: wang.yuqi <noooop@126.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

tests/entrypoints/test_utils.py

@@ -1,5 +1,9 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+import base64
+
+import requests
+
 from vllm.entrypoints.utils import sanitize_message
 
 
@@ -8,3 +12,11 @@ def test_sanitize_message():
         sanitize_message("<_io.BytesIO object at 0x7a95e299e750>")
         == "<_io.BytesIO object>"
     )
+
+
+def encode_base64_content_from_url(content_url: str) -> dict[str, str]:
+    with requests.get(content_url) as response:
+        response.raise_for_status()
+        result = base64.b64encode(response.content).decode("utf-8")
+
+    return {"url": f"data:image/jpeg;base64,{result}"}