[Python] Getting strange response from Shopify Admin API

I'm trying to add a chat script to layout/theme.liquid in a Shopify store using the Admin API.

GET request works fine (200 OK), and I successfully retrieve the asset content. PUT request fails with a 404 Not Found error when trying to update the asset.

asset_url = f"https://{shop}/admin/api/2025-01/themes/{theme_id}/assets.json"
params = {"asset[key]": "layout/theme.liquid"}
# here 200
asset_resp = requests.get(asset_url, headers=headers, params=params)
if asset_resp.status_code != 200:
return {"error": "Failed to get theme.liquid", "details": asset_resp.json()}
asset_data = asset_resp.json().get("asset", {})
current_content = asset_data.get("value", "")

script_tag = f'<script type="module" src="{SCRIPT_URL}"></script>'
if script_tag in current_content:
return {"message": "Script already injected in theme.liquid"}

if "</body>" in current_content:
new_content = current_content.replace("</body>", script_tag + "\n</body>")
print("script iputed")
else:
new_content = current_content + "\n" + script_tag

update_payload = {"asset": {"key": "layout/theme.liquid", "value": new_content}}
update_url = f"https://{shop}/admin/api/2025-01/themes/{theme_id}/assets.json"

# BUT here 404
update_resp = requests.put(update_url, headers=headers, json=update_payload)
print(update_resp.url)
print(update_resp.status_code)


API version is consistent (2025-01 for both GET and PUT). Access token is correct (same token works for GET). The asset key exists (GET confirms it). I’m using JSON body for PUT (not params).

Continue reading...