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Attachment Upload via URL for Targetprocess API

I am in the process of developing an integration that involves programmatically uploading attachments to a bug ticket within Targetprocess using the API. I have been utilizing the UploadFile.ashx endpoint for this task.

My current approach involves fetching the file content from a URL and then uploading it as an attachment to a specific bug ID using a POST request with multipart/form-data.

Could you please advise on the following points:

  1. Does the UploadFile.ashx endpoint support this method of uploading files using content fetched from a URL?
  2. Are there any known issues or limitations with the UploadFile.ashx endpoint that might result in empty file contents upon upload?
  3. Can you confirm whether there are any additional headers or metadata that need to be included in the POST request to ensure the file content is uploaded correctly?
  4. Here is a part of the code I use to upload :
def upload_attachment_to_targetprocess(bug_id, attachment_url):
    targetprocess_domain = os.environ['TARGETPROCESS_DOMAIN']
    targetprocess_access_token = os.environ['TARGETPROCESS_ACCESS_TOKEN']
    api_token = os.environ.get('AIRTABLE_API_KEY')

    headers = {
        'Authorization': api_token
    response = requests.get(attachment_url, headers=headers, allow_redirects=True)
    if response.status_code != 200:
        print(f"Failed to download attachment. Status Code: {response.status_code}")
        return None

    file_content = response.content
    if not file_content:
        print("No content in file")
        return None
    print(f"Size of the content retrieved: {len(file_content)} bytes")
    file_name = attachment_url.split("/")[-1]

    content_type = mimetypes.guess_type(file_name)[0] or 'application/octet-stream'
    print(f"Guessed Content-Type: {content_type}")

    upload_url = f"{targetprocess_domain}/UploadFile.ashx?access_token={targetprocess_access_token}"
    files = {'file': (file_name, file_content, content_type)}
    data = {'generalId': bug_id}
        response = requests.post(upload_url, files=files, data=data)
        return response.json()
    except requests.exceptions.RequestException as error:
        print(f'Error uploading attachment to Targetprocess: {error}')
        return None