from urllib.parse import quote

# In async_upload_data_to_s3(), when constructing the URL:
encoded_key = quote(batch_logging_element.s3_object_key, safe="/")

if self.s3_endpoint_url and self.s3_bucket_name:
    if self.s3_use_virtual_hosted_style:
        url = f"{protocol}{self.s3_bucket_name}.{endpoint_host}/{encoded_key}"
    else:
        url = self.s3_endpoint_url + "/" + self.s3_bucket_name + "/" + encoded_key
else:
    url = f"https://{self.s3_bucket_name}.s3.{self.s3_region_name}.amazonaws.com/{encoded_key}"

---

import hashlib
import requests
from botocore.auth import SigV4Auth
from botocore.awsrequest import AWSRequest
from botocore.credentials import Credentials
import httpx

creds = Credentials('ACCESS_KEY', 'SECRET_KEY')
# Object key with base64 padding (==)
url = 'https://garage.example.com/bucket/key_with_base64==.json'
data = '{"test": 1}'
content_hash = hashlib.sha256(data.encode('utf-8')).hexdigest()

headers = {
    'Content-Type': 'application/json',
    'x-amz-content-sha256': content_hash,
}

req = requests.Request('PUT', url, data=data, headers=headers)
prepped = req.prepare()

aws_request = AWSRequest(
    method=prepped.method,
    url=prepped.url,
    data=prepped.body,
    headers=prepped.headers,
)

SigV4Auth(creds, 's3', 'region').add_auth(aws_request)

# botocore signed against canonical path: /bucket/key_with_base64%3D%3D.json
# httpx sends the request to: /bucket/key_with_base64==.json
# The server sees ==, computes signature with ==, doesn't match %3D%3D → 403
response = httpx.put(url, data=data, headers=dict(aws_request.headers.items()))
print(response.status_code)  # 403

---

LiteLLM:ERROR: s3_v2.py:380 - Error uploading to s3: Client error '403 Forbidden' for url
'https://garage.example.com/litellm-usage/2026-03-25/time-18-07-17-208437_resp_bGl0ZWxsbT...OQ==.json'


Garage's error response:

<Error>
  <Code>AccessDenied</Code>
  <Message>Forbidden: Invalid signature</Message>
  <Resource>/litellm-usage/2026-03-25/time-18-07-17-208437_resp_bGl0ZWxsbT...OQ==.json</Resource>
</Error>