Informational

    HTTP 100 Continue

    The server has received the request headers and the client should proceed to send the request body.

    Check a URL for HTTP 100

    Paste any URL to see whether it currently returns 100. Runs a live HTTP probe and follows redirects.

    What does HTTP 100 mean?

    HTTP 100 Continue is an interim response indicating that the client should continue sending the request body. This is used when the client sends an Expect: 100-continue header, allowing the server to reject the request before the full body is transmitted — saving bandwidth.

    Common Causes

    • •Client sent Expect: 100-continue header
    • •Large file uploads where pre-validation is needed
    • •API requests with large payloads

    How to Fix It

    1. 1.This is normal behaviour — no fix needed
    2. 2.If you see this unexpectedly, check your HTTP client library settings

    SEO Impact

    No direct SEO impact. This is an interim response that browsers handle automatically.

    Monitor HTTP 100 with LemWatch

    LemWatch tracks the final response code, not interim 1xx responses. If uploads are failing after a 100 Continue, check your server timeout settings.

    Related Status Codes

    101

    Switching Protocols

    102

    Processing

    200

    OK

    103

    Early Hints

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