MethodNotImplemented: 501 Received http2 header with status: 404

I have deployed triton docker container in vertex ai and here is my code to send request to vertex ai using python aiplatform_v1.
Code:
```
import numpy as np
import json
import time
import cv2
import os
import base64
import matplotlib.pyplot as plt
from google.cloud import aiplatform_v1
import traceback
from google.api.httpbody_pb2 import HttpBody

project = "my-project-name"
location = "location"
endpoint_id = "endpoint-id"

endpoint_name = f"projects/{project}/locations/{location}/endpoints/{endpoint_id}"

client = aiplatform_v1.PredictionServiceClient()

s_path = "/input-images-folder-path/"
s_data = os.listdir(s_path)

input_data = [cv2.imread(os.path.join(s_path,s_data[0]))]
pred_time = []
print("Start Time:",time.time())
for image_name in s_data:

if image_name.split(".")[-1]!="txt":

try:
input_data = [cv2.imread(os.path.join(s_path,image_name))]
b64_data = []
for img in input_data:
content = str(base64.b64encode(cv2.imencode('.png', img)[1].tobytes()).decode("utf-8"))
b64_data.append(content)

b64_data = np.array(b64_data, dtype=object)

payload = {
"id": "0",
"inputs": [
{
"name": "input_image",
"shape": [1,1],
"datatype": "BYTES",
"parameters": {},
"data": b64_data.tolist(),
}
],
}

# Convert payload to bytes
payload_inst = json.dumps(payload).encode("utf-8")
http_body = HttpBody(content_type="application/octet-stream", data= payload_inst)

request = aiplatform_v1.RawPredictRequest(endpoint = endpoint_name, http_body = http_body)

start = time.time()
print("start prediction.........")
response = client.raw_predict(request=request, timeout=30) # Timeout in seconds
print("end prediction.........")
end = time.time()
pred_time.append(end-start)

except Exception as e:
print(traceback.print_exc())
print(e)
print('====================================================================================================')

print("End Time:",time.time())
print("Average Time:",sum(pred_time)/len(pred_time))
```
Running above code i got "501 Received http2 header with status: 404" error.
Error shows that endpoint is not found but i followed official documentation.

Can someone tell me what's wrong in code?

Start with the endpoint_name and PredictionServiceClient setup in the issue's Python example, then compare the RawPredictRequest construction with the documented Vertex AI Triton request path. Done means identifying whether the endpoint and request configuration reach the deployed model successfully; the payload names no repository files or tests to run.

Written by the indexing model from the issue text.