Troubleshooting of HTTP errors

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HTTP status code

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400 Bad Request[edit]

Root cause of 400 Bad Request. HTTP Error 400. The request is badly formed.

  • "the server cannot or will not process the request due to something that is perceived to be a client error (for example, malformed request syntax, invalid request message framing, or deceptive request routing)"

Possible solution:

  • Modify the request headers

403 Forbidden Error[edit]

See: How to fix the 403 forbidden error

404 File Not Found[edit]

Solution: Check if the accessed link is correct, see "404 Not Found | Possible solutions for pages not found"

405 Method Not Allowed Error[edit]

Solution: Check if the accessed file or resource supports the HTTP protocol being used. For example, if the resource is restricted to POST requests but you're using GET.

414 Request-URI Too Large[edit]

Solution: Change the request protocol to POST instead of GET

415 Unsupported Media Type[edit]

Solution: "Set the Content-Type or Content-Encoding in the request or direct access to the data." For example: When encountering this error with RESTful API, a possible solution is to add to the HTTP Headers:

Content-Type: application/json

429 Too Many Requests[edit]

Root Cause:

  • Accessing website resources or web service API too frequently

Solutions:

  • Adjust the delay time based on your usage patterns and the service's limits e.g. Increase the delay time between requests (e.g., add a 1-second pause between each request).
  • If accessing a web service API, read the documentation to understand the API's rate limits. Check if you can request a higher quota limit from the service provider
  • Implement exponential backoff retry mechanism: Detect rate limit errors (HTTP 429) in your application. Increase the delay time with each failed retry (e.g., 2 seconds, 4 seconds, 8 seconds). Continue retrying until the request succeeds or maximum retry count is reached.

502 Bad Gateway[edit]

Cause:

  • Error occurs between network devices, users cannot directly handle it.

Solutions:

  • Bypass browser cache, refresh the page
  • Try reconnecting after a while

Error 1020: Access Denied[edit]

  • See link for understanding how to resolve Error 1020 Access Denied to get your website back online
Content-Type: application/json

200.jpg From HTTP Cats

Related websites:

Other possible root causes[edit]

  • CDN (Content delivery network)

Related pages[edit]

References[edit]


Troubleshooting of ...

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