reflex-dev/reflex · error · Exception

deployment failed: HTTP {ex.response.status_code} - {ex.resp

Error message

deployment failed: HTTP {ex.response.status_code} - {ex.response.text}

What it means

Raised by get_hostname when a failed reserve response has no parseable JSON detail — the raw HTTP status code and body text are wrapped into the exception instead. This is the fallback error shape for unexpected server responses.

Source

Thrown at packages/reflex-hosting-cli/src/reflex_cli/utils/hosting.py:1515

        timeout=constants.Hosting.TIMEOUT,
    )
    try:
        response.raise_for_status()
    except httpx.HTTPStatusError as ex:
        if ex.response.status_code == 413:
            raise Exception(
                "deployment failed: the deployment payload is too large (over 100MB). "
                "Please reduce the size of your project by removing large files or "
                "adding them to your .gitignore file."
            ) from ex
        try:
            ex_details = ex.response.json().get("detail")
            if ex_details == "hostname taken":
                return {"error": "hostname taken"}
            raise Exception(f"deployment failed: {ex_details}") from ex
        except (ValueError, AttributeError):
            # Response is not valid JSON or missing detail field
            raise Exception(
                f"deployment failed: HTTP {ex.response.status_code} - {ex.response.text}"
            ) from ex
    response_json = response.json()
    return response_json


def extract_subdomain(url: str):
    """Extract the subdomain from a given URL.

    Args:
        url: The URL to extract the subdomain from.

    Returns:
        str | None: The extracted subdomain, or None if extraction fails.

    """
    from urllib.parse import urlparse

View on GitHub (pinned to 45b8ed5ab7)

Solutions

1. Retry the deploy after a short wait — transient 5xx/gateway errors usually resolve
2. Check the Reflex hosting status page/dashboard for ongoing incidents
3. If persistent, capture the status code and body from the message and report to Reflex support

for attempt in range(3):
    try:
        result = get_hostname(client, app_id, app_name)
        break
    except Exception as e:
        if "HTTP 5" in str(e) and attempt < 2:
            time.sleep(2 ** attempt)
            continue
        raise

When it happens

Trigger: The hosting service returns a non-2xx with an HTML/plain-text body (proxy error page, 502/503 from a gateway, or a malformed JSON body) during hostname reservation/deploy.

Common situations: Transient hosting-service outages; Cloudflare/proxy error pages masking the API; partial maintenance-window responses.

Understand the failure class

Background: "API error: {status}" and "HTTP 401/403/404/429/5xx" errors: non-2xx HTTP responses explained — this error's family across 27 libraries.

Related errors

• bad hostname provided
• deployment failed: {ex_details}
• app_name should be a string
• ChildrenTypeError(component=cls.__name__, child=child)
• Do not override _add_style directly. Use add_style instead.

AI-assisted analysis of reflex-dev/reflex@45b8ed5ab7 (2026-08-28). Data as JSON: /api/errors/8ba881148090ea1c. Report an issue: GitHub.