1XX Response Codes

Thursday, February 27, 2020

Response Codes

What is a 1xx Response Code?

The 1xx response typically consists of an HTTP status line, a header, and is terminated by an empty line. 1xx status codes are only defined in version HTTP/1.1 and are not supported by the previous HTTP/1.0 version. Hence, web servers should not respond with a 1xx code to an HTTP/1.0 client.

As 1xx HTTP codes are only meant for informational purposes, browsers and user agents will not process and show these response codes on the front-end screen like other series of response codes. Browsers ignore these status codes and continue to process the remaining parts of the requests. There are only four status codes used in the 1xx series:

  1. 100 – Continue
  2. 101 – Switching Protocols
  3. 102 – Processing
  4. 103 – Early Hints

What does the 1xx response code look like?

HTTP status codes that fall under the 1xx category are considered informational status codes. When the status code is informational in nature, it will only tell the user or software agent that the request has been obtained. For instance, you may only encounter the status code 100. But you are completely unaware of the exact cause of the appearance of the status code.

Guide to 1xx Response Codes-

Some of the most common HTTP 1xx status codes are listed below:

Unofficial Codes


Web servers send 1xx-series HTTP status codes that are only meant for informational purposes. We have discussed above the list of 1xx HTTP status codes for informational responses returned by a web server in response to HTTP requests from the client browser.


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