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Explaining and Solving 100, 101, 102, and 103 Error Codes

Server response codes are an essential aspect of the Hypertext Transfer Protocol (HTTP) used in web communication. These codes are three-digit numeric messages returned by a web server to a client's browser, indicating the status of the requested HTTP transaction. Understanding these codes is crucial for diagnosing and troubleshooting website issues, as they provide valuable information about the success or failure of a request.

Suppose you're interested in learning more about server response codes and how they impact website performance. In that case, you can explore our comprehensive article here: HTTP Status Code Checker. This article covers everything you need to know about HTTP status codes, including their meanings, classifications, and best practices for handling them effectively.

1. Understanding Server Response Codes: 1xx Informational Errors

Server response codes are standard HTTP status codes used to communicate the outcome of a client's request to a server. Among these, the 1xx series, known as Informational status codes, serve a unique purpose. Unlike other response codes, such as the 2xx series for successful requests or the 4xx and 5xx series for errors, the 1xx series does not indicate an error. Instead, these codes are purely informational, providing the client with status updates or indicating that the server is still processing the request. They convey interim responses while the server processes the client's request.

These informational status codes are a vital part of the HTTP protocol, ensuring transparent communication between clients and servers during data exchange.

2. Types of 1xx Errors and Their Occurrence Rate

Error 100 Continue is encountered most frequently because it is used in HTTP/1.1 to allow the server to begin processing a request before the client sends the request body. This status code indicates that the initial part of the request has been received, and the client can continue sending the rest of the request if needed. It serves as a signal from the server to proceed with the request, facilitating more efficient communication between the client and server.

Error 101 Switching Protocols is encountered less frequently as the server uses it to inform the client that it is changing to a different protocol. This status code indicates that the server is acknowledging the client's request to switch protocols and will now communicate using the new protocol specified by the client. It is typically used during the WebSocket handshake process when upgrading from HTTP to WebSocket protocol.

Errors 102 Processing and 103 Early Hints are encountered less frequently as they are used in more specialized scenarios. Error 102 indicates that the server is still processing the request, but the client can expect to receive a final response soon. It is used when the processing time is expected to be longer than usual, such as when generating a complex response.

The server uses error 103 to provide the client with early hints about the final response. It is typically used to indicate to the client that additional resources, such as links or prefetching suggestions, will be provided in the final response.
Here are some figures confirming these findings:

- According to a study by Cloudflare, in 2022, the 100 Continue error accounted for 97% of all 1xx errors.
- The 101 Switching Protocols Error accounted for 2% of all 1xx errors.
- Errors 102 Processing and 103 Early Hints accounted for 1% of all 1xx errors.

3. Explanation of Error Code 100 Continue

Error code 100 Continue indicates that the server has received the initial part of the request and is ready for the client to continue with the rest of the request. This response is typically used in HTTP/1.1 to inform the client that the server is ready to receive the request's body.

3.1. How to Fix Error Code 100 Continue

To address Error code 100 Continue, ensure the client sends the remaining part of the request to the server as expected. This error is more informational than problematic and does not usually require specific action on the client's part. Simply proceeding with the request should resolve this issue.

4. Explanation of Error Code 101 Switching Protocols

Error code 101 Switching Protocols indicates that the server is transitioning to a different protocol as requested by the client. This response is typically used in HTTP/1.1 to inform the client that the server will now be communicating using a different protocol, as specified in the Upgrade header of the request.

4.1. How to Fix Error Code 101 Switching Protocols

To address Error code 101 Switching Protocols, the client should follow the instructions provided by the server and switch to the specified protocol for further communication. Ensure that the client correctly handles the protocol transition indicated by the server to avoid any communication issues.

5. Explanation of Error Code 102 Processing

Error code 102 Processing is an HTTP status code that indicates the server has received and is processing the request. Still, the processing has not yet been completed. This status code is used when the server needs more time to handle the request, and the client should continue to wait for a final response.

5.1. How to Fix Error Code 102 Processing

To address Error code 102 Processing, the client should continue to wait for the server to complete processing the request. Typically, no specific action is required from the client's end, as this status code indicates that the server is still working on the request. However, suppose the server consistently returns this status code without completing the request within a reasonable timeframe. In that case, further investigation may be necessary to determine the cause of the delay.

6. Explanation of Error Code 103 Early Hints

Error code 103 Early Hints is an HTTP status code indicating the server is sending preliminary response headers to the client before the final response is available. This status code informs the client about potential response headers that may affect how it handles the subsequent request.

6.1. How to Fix Error Code 103 Early Hints

Since Error code 103 Early Hints is an informational status code, there is typically no action required from the client to fix it. The client should continue to process the response headers received and await the final response from the server. This status code is usually handled automatically by web browsers and other HTTP clients, allowing them to optimize the handling of subsequent requests based on the early hints provided by the server.

7. Non-Standard Error Codes

In addition to the standard HTTP error codes, there are also non-standard error codes used in specific contexts. These codes are not part of the official HTTP status code definitions and are often employed for specific applications or servers. Non-standard error codes in the 1xx range include 110, 111, 112, 113, and 199.

These codes are used to indicate various warning and informational states that don't fit into the conventional status code categories. They provide more detailed insights into specific issues or conditions encountered by the server.

8. How to Identify 1xx Group Errors

When it comes to identifying 1xx group errors, various services can help you pinpoint server response codes effectively. These services include Pingdom, UptimeRobot, StatusCake, Google PageSpeed Insights, Microsoft Azure Monitor, and GTMetrix. These tools offer comprehensive monitoring and analysis capabilities to detect any HTTP status codes, including those in the 1xx group, and provide insights into website performance and availability.

In addition to these services, Atomseo Broken Link Checker is a valuable tool that allows you to obtain server response codes and perform free scans of up to 1500 links. This service is beneficial for identifying any broken links or errors, including those related to the 1xx group, and ensuring the smooth functioning of your website. Use this service to manage and optimize your website's performance effectively.

9. Learn More About Other Status Codes