How I look up HTTP status codes during debugging

HTTP status codes are short signals from a server. They tell me whether a request succeeded, redirected, failed on the client side, or failed on the server side.

The HTTP Status Codes tool helps me inspect the input and output without writing a one-off script first.

The simple idea

HTTP status codes are short signals from a server. They tell me whether a request succeeded, redirected, failed on the client side, or failed on the server side.

I use it to answer one focused question at a time, then I review the result before using it anywhere important.

Step 1: Start with the first digit

Start with the first digit.

Step 2: Understand 2xx as success

Understand 2xx as success.

Step 3: Understand 3xx as redirects

Understand 3xx as redirects.

Step 4: Understand 4xx as client-side request problems

Understand 4xx as client-side request problems.

Step 5: Understand 5xx as server-side failures

Understand 5xx as server-side failures.

Step 6: Read the specific status meaning

Read the specific status meaning.

Step 7: Always inspect the response body and headers too

Always inspect the response body and headers too.

My checklist

Before I trust the result, I check:

• Start with the first digit.
• Understand 2xx as success.
• Understand 3xx as redirects.
• Understand 4xx as client-side request problems.
• Understand 5xx as server-side failures.
• Read the specific status meaning.
• Always inspect the response body and headers too.

The tool makes the mechanical part faster. The decision still belongs to me: is this result correct, safe, and appropriate for the real task?