ChatInterface type='messages', API still uses tuples format

[taoari]

Describe the bug

When set type="messages" for ChatInterface. In the GUI, history is in messages format, but from API call, history is in tuples format.

Have you searched existing issues? 🔎

• [X] I have searched and found no existing issues

Reproduction

import gradio as gr

def echo(message, history):
    print(message, history)
    return message

demo = gr.ChatInterface(fn=echo, type='messages', title="Echo Bot")
demo.launch()

from gradio_client import Client

client = Client("http://localhost:7860/")
result = client.predict(
        message="Hello!!",
        api_name="/chat"
)
print(result)

result = client.predict(
        message="Hello again!!",
        api_name="/chat"
)
print(result)

The following is from Gradio Web:

hello []
hello2 [{'role': 'user', 'metadata': {'title': None}, 'content': 'hello'}, {'role': 'assistant', 'metadata': {'title': None}, 'content': 'hello'}]

The following is from gradio_client:

Hello!! []
Hello again!! [['Hello!!', 'Hello!!']]

where history format is inconsistent.

Screenshot

No response

Logs

No response

System Info

Gradio Environment Information:
------------------------------
Operating System: Darwin
gradio version: 4.44.0
gradio_client version: 1.3.0

------------------------------------------------
gradio dependencies in your environment:

aiofiles: 23.2.1
anyio: 4.4.0
fastapi: 0.112.2
ffmpy: 0.4.0
gradio-client==1.3.0 is not installed.
httpx: 0.27.0
huggingface-hub: 0.24.6
importlib-resources: 6.4.0
jinja2: 3.1.4
markupsafe: 2.1.5
matplotlib: 3.9.2
numpy: 1.26.4
orjson: 3.10.7
packaging: 24.1
pandas: 2.2.2
pillow: 10.4.0
pydantic: 2.8.2
pydub: 0.25.1
python-multipart: 0.0.9
pyyaml: 6.0.2
ruff: 0.6.2
semantic-version: 2.10.0
tomlkit==0.12.0 is not installed.
typer: 0.12.5
typing-extensions: 4.11.0
urllib3: 2.2.2
uvicorn: 0.30.6
authlib; extra == 'oauth' is not installed.
itsdangerous; extra == 'oauth' is not installed.

gradio_client dependencies in your environment:

fsspec: 2024.5.0
httpx: 0.27.0
huggingface-hub: 0.24.6
packaging: 24.1
typing-extensions: 4.11.0
websockets: 12.0

Severity

Blocking usage of gradio

[abidlabs]

Thanks @taoari for flagging this!