A Complete Guide to Proxy Server Error Codes

Proxy servers are useful for companies that need data for business operations and implementing marketing plans. This valuable information is needed in various areas, from sales analysis to SEO and social media. Across all these extensive fields, the only thing that helps in data extraction is a useful tool known as a proxy server.

But parsing is not as simple as it seems, and not all work related to parsing works without a proxy server, because data extraction faces many obstacles during the procedure, which usually lead to errors for the user.

One such error is HTTP proxy error codes, which can appear on the user's screen for various reasons. What do these proxy errors do? Sometimes they cause a temporary delay in web scraping, and sometimes they permanently restrict the user's access to the requested resource. Users need to know what these errors mean and how to solve them.

It should also be noted that we are talking about HTTP error codes. These types of errors represent different types of messages. That is, it is a specific message about what event occurred and why there was a delay or halt in processing the request.

Users encounter many proxy error codes related to web scraping, and when their request is stopped or delayed by the site, they face these issues. Users may get frustrated and try to get rid of them, but you should know that these errors indicate a specific message, and knowing that, you will also be able to get rid of these errors. And you will be able to easily get the necessary information.

What is a Proxy Server Error?

A proxy error can occur due to either the server or the user. Typically, this error is a message sent from the main Internet network to your device through a proxy server. A proxy error usually consists of three digits. A proxy server error is a security measure established by the Internet to protect you and your network from internal or external issues.

To continue using the proxy server, you need to find a solution to the problem. Although it is sometimes difficult to find a solution when these error codes are redirected and mysterious. But some basic codes can be easily deciphered, so this information will be useful for you.

If you are familiar with HTTP status codes, you will understand that they are similar to each other. HTTP status codes show the status of the current event, and thus you can find out the status of the error, which is why they are called HTTP status codes.

The code informs about a specific problem that occurred during the processing of the request. HTTP codes are numerous. We will only consider the most common codes, so in this article they are classified for simplicity.

A specific type of restriction imposed by the Internet on the user. This restriction is in the form of a delay or permanent blocking of the user when trying to use the site. Most web servers create such proxies to ensure the security and privacy of their content.

Proxy Error Class:

Proxy errors are a major cause of server issues. These error messages come from the Internet network to your system through a proxy server. For example, error 404 means that the content requested by the user is not found anywhere.

Usually, when companies try to scrape information from websites, they are easily blocked. Their IP addresses are known by their location, and therefore they are blocked by servers. So the proxy server does the following: it removes your IP address to present itself, and exactly hides your identity. Thus, you can easily obtain information or extract data without fear of blocking and errors.

These errors may occur because many brands have completed configuration in HTTP parameters. Let's say you visited some site, but it gives a proxy server error asking you to confirm the action you performed. If you want to avoid this error occurring. Always remember that when configuring an HTTP filter, any information and signatures are removed from its settings. It is enough to change the settings to allow all information and signatures.

At the same time, proxy server error codes may occur, which creates problems when performing work. If you want to prevent these errors, try using the various solutions below to solve these common proxy server errors on your own without problems.

Common Error Codes and Their Classes:

You are calmly working with your browser and suddenly encounter a proxy server error. A common error we encounter in everyday life is 404, which usually means "content not found". Proxy server errors are similar to HTTP status codes. They are almost three-digit numbers. Each of these numbers indicates an error that occurs when using the proxy server. The error can be caused either on your side or on the user's side. It can also occur on the server side. These three-digit numbers indicating an error are divided into 5 classes. A brief description is given below,

1xx Informational Error Code:

These are the types of errors that are uncommon. These types of errors occur when the server is in the process of executing a request.

100 - Continue:

This proxy server error code is to continue the request. It usually appears when the request is partially processed. Or when the remaining request needs further processing. Typically, the user first sends a request with "Expect: 100-continue", and then the server sends the user 100 proxy codes. The expectation in this statement usually indicates that no unnecessary requests should be sent. This usually happens when the server rejects the initial request.

101 - Switching Protocols:

Typically, the user receives error code 101. When the browser requests a change of communication protocols, the user receives this code. This usually happens during a transaction. And when the client accepts the code sent by its web server. Then the user again receives an HTTP status code for confirmation, which is "100 - Switching Protocols".

102 - Processing (WebDAV):

When a user sends multiple requests consisting of basic requirements, it can be said that this is a WebDAV request. The server may need additional time to process a large request. Therefore, the web server sends code 102, which usually indicates that the request is being processed. This error means that the request has been received and the web server is processing it.

103 - Early Hints:

Error 103 appears on the screen when the web server has not yet started processing the request. This name usually serves as a hint that the web server has not yet started processing your request.

2xx Successful Status Code:

When the proxy server successfully received your HTTP request. And now your request is sent to the site you need. Then you receive a response in the form of a code. This code usually starts with 200 and goes up to 299. 200 is the most common code, meaning that the request was completed by the server. However, be careful with codes other than 200, as this may be related to an error. The most common errors in the code (200-299) are (201-206).

201 - Created:

When a new resource is created based on your request. When the web server has fully processed your request, it sends you a 201 message. The initial request initiates the creation of a new resource on the server. For example, when a user adds login data, the server creates a response.

202 - Accepted:

When the server receives a request from a user but has not yet started processing it. This usually means that the web server has accepted the request sent by the user. However, the results will be shown after the web server finishes processing the request.

203 - Non-Authoritative Information:

When the web server has finished processing the request but returns information from another source. Code 203 usually means that the request has been processed and the web server is returning it from another source.

204 - No Content:

When the web server cannot find any content related to the user's request, it sends a 204 message. This proxy server error code usually indicates that no content was found for the user's request.

205 - Reset Content:

This code is very similar to 204. However, this code usually indicates that the request was successfully processed, but no content is returned. It typically appears to tell the user to reset the document.

206 - Partial Content:

When the web server receives partial ranges of different resources in the request header. This code is usually sent when the web server returns a portion of the content, and this typically occurs when there are many different resources.

3xx - Redirection Error:

These types of errors indicate that the web server needs to take some action on behalf of the user to complete the request. These HTTP status codes are not a problem when using Chrome or Safari. However, when using scripts, there is no need to redirect requests to other sites. These proxy codes create infinite loops, so web browsers usually do not continue after 5 redirects for the same request. Below are some of the common codes starting with 300.

300 - Multiple Choices:

This code usually occurs when a site URL is specified for more than one resource. The browser cannot decide which URL to use and sends a 300 code to the user. This error can be fixed by checking the HTTP headers and ensuring that the URL is specified for a single resource so that the web server can successfully access the page.

301 - Resource Moved Permanently:

When a URL is set to permanently redirect to a completely different URL. Then the web server sends a 301 code to the user. When you see a 301 code, you cannot see the original URL, and the search engine only gives you the redirected URL. Most search engines can track only up to 5 redirects for a single URL. More than 5 redirects will create an infinite loop, and some web browsers will display a "Too Many Redirects" message. Additionally, this is the most common of the 300 class proxy server error codes.

302 - Resource Moved Temporarily:

This code usually appears on the screen when a temporary redirect is set on the original URL. In this case, the user is redirected to another URL after the request is completed.

303 - See Another Resource:

When the resource specified in the request is located at a different URL, the web server sends this code. Instead of the code, the GET method should be used. Also, keep in mind that the requested page will only be indexed after receiving a 200 success code.

304 - Resource Not Modified:

The web server usually sends this code when the resource in the request has not been modified since the last request. The web server assumes that re-accessing the data is not necessary because it will be saved by the user or the user has a copy of this data that has not changed.

305 - Use Proxy:

Some sites require the use of a proxy server. Thus, if you are not using a proxy server, the web server sends you this 305 code, which means you must use a proxy server. The browser window also displays the proxy server address. Some browsers do not show the proxy server response for security reasons.

306 - Proxy Switching

For some URLs, there are specific properties. They require using specific proxy servers. Therefore, the web server sends you this code, indicating the need to switch to a different proxy to access the URL you need.

307 - Temporary Redirect:

When the resource in the request is temporarily moved to another address. The URL is specified in the header. This redirect occurs for a short time, and on the next request you will access the original URL. This status code is usually used only in the HTTP/1.1 protocol.

308 - Permanent Redirect:

When the resource in the request is permanently moved to another address. The URL is specified in the header. This is a permanent redirect to another URL. It is similar to 307, just as 301 and 302 are similar.

4xx Client Error Codes:

Codes starting with 400 and 500 are the main type of errors. If you get a 400 error, it means the problem is on your side. The issue is with your request or browser.

400 - Bad Request:

When there is a problem with your request or the site you are accessing cannot parse your request, the web server sends you this code. Incorrect syntax or improper formatting are the issues that cause this error in the browser.

401 - Unauthorized:

When you visit an unauthorized site. And the web server requires authentication from you. It sends you this code. Typically, this error is returned by the proxy server. And when you finally provide your credentials, the browser grants you access to the desired URL.

402 - Payment Required:

This code is rare and mostly used for future purposes. The main goal of creating this code was for use in digital payment systems.

403 - Forbidden:

If your request is correct or the web server understood your request, but refuses to respond, then this code is sent. This usually happens when viewing a specific resource is forbidden.

404 - Not Found:

When the requested resource is not found, the web server sends you this code. When the request is correct, but the sought resource is not found anywhere, you receive this code. It is widely known as a user error. It mainly appears when a URL is redirected or changed.

405 - Method Not Allowed:

When the web browser knows the method, but it is forbidden and therefore cannot be used. For example, deleting a resource using the DELETE method is forbidden by the API.

406 - Not Acceptable:

When the web server does not find any content or resource in the request that you provide to the server. Usually this happens when the web server has conducted negotiations and found no content, then it sends you the code.

407 - Proxy Authentication Required:

When authentication is required or when the tunnel cannot connect, the proxy server sends this code to the user. Usually this happens when you are using a scraping tool and it is not authenticated on the proxy server or its credentials are incorrect.

It is necessary to update the proxy server settings and whitelist IP addresses, as well as enter the correct credentials. Also, ensure that all information is included in the request.

408 - Request Timeout:

When the user has not made a request and the server is configured to wait, the web server sends this code to the user. Without any changes, the user can repeat the request later at any time. If the 408 error persists, then it is necessary to reduce the load on the web server after detecting errors. Additionally, you need to check the Wi-Fi, as the error occurs due to connection issues.

409 - Conflict:

It is not related to security and the web server's permissions regarding a specific application. Conflict is not defined in HTTP protocols. When the web server completes negotiations, they cannot be processed due to a conflict with resources.

410 - Gone:

When a resource is no longer available, the web server sends this code to the user. It means that the requested resource will no longer be available. This error is very similar to 404, but in this case, it is more permanent than 404.

411 - Length Required:

If the content length is not fully determined, the web server refuses to accept the request. The user must retry the request by providing a content-length field containing the information about the request provided by the user.

412 - Precondition Failed:

When more than one precondition is specified in the request headers, the web server sends this code to the user. It can also appear when the web server considers the requests sent by the user to be false.

413 - Request Entity Too Large:

When the request entity is too large for the web server. And the web server refuses to process such large files, then this code is sent to the user. Additionally, the web server closes the connection, preventing the user from accessing the same URL.

There are certain limits on uploading such large files, and this error occurs when the request exceeds the set limits.

414 - Request-URL Too Long:

When the web server refuses to serve the request or the requested URL is so long that the server cannot process it. This error is usually sent when the user incorrectly changed POST to GET. In case of long information requests. And the client fell into a black hole of URL directions.

When a user tries to attack security holes present in some servers, the web server sends this code to the user. Also when the user uses fixed-length buffers for manipulations and URL read requests. Usually, web servers set a limit on the length of a genuine URL. If the long URL is valid and the user still gets code 414, then the web server needs to reconfigure these URLs.

415 - Unsupported Media Type:

When the request information has a format that is not supported by the requested resource, this code is sent to the user. When the web server cannot process unknown formats, it sends code 415 to the user.

416 - Requested Range Not Satisfiable:

If the range is not specified in the user's request or it may be larger, then they will encounter this code 416. In this case, if the resource file has a size of 2000 bytes and the requested range is 1500-2500, then it will not be considered an acceptable range.

417 - Expectation Failed:

When the expectation specified in the request header cannot be fulfilled by the server or proxy server. This error can also occur when the web server cannot fulfill the request. Meanwhile, the server has clear indications that it could not process the request.

429 - Too Many Requests:

When the user sends many requests simultaneously within a certain limited time period, the web server sends this code to the user. Additionally, if the user uses the same IP address, the site displays this error to protect against overload. Using proxy servers and setting delays between IP addresses and a specific time interval can solve this problem.

5xx - Server Error:

This is the most common type of error that users encounter, similar to 400. They usually occur when the server has received a request but cannot process it. Or it encountered a problem while processing it.

To solve the problem with 500 codes, it is necessary to change the proxy network, rotate IP addresses, and change the IP address type. When using a home proxy network, it is better to ensure reliability. Below are the most common types of errors.

500 - Internal Server:

When the server encounters an unexpected problem or condition, it sends this code to the user. Additionally, the problem causes a delay in the response to the request, which ultimately leads to this error.

501 - Not Implemented:

when the server cannot provide the requested resource due to an unrecognized or unsupported method in the request. This code is sent to the user when the server can provide the resource.

502 - Bad Gateway:

When the server acts as a gateway or proxy server and receives an invalid response from any other server. This type of error usually occurs during data collection, and the web server sends the user a 502-bad gateway code.

503 - Services Unavailable:

When the web server simultaneously receives a request and also overloads it with other requests. This error can also occur when the web server is scheduled for downtime or is under maintenance. This is a type of error that is issued by the web server.

504 - Gateway Timeout:

When the server acts as a user or external gateway or may be a proxy server and does not receive a response in time, a 504 message is sent to the user. When server A does not receive a response from server B, this error is issued to the user.

505 - HTTP Version Not Supported:

If the server cannot support the HTTP protocol and the request message, then the web server sends this code to the user.

507 - Insufficient Space:

When the server has completely exhausted disk space and can no longer process the request, the user encounters this error.

510 - Extensions are Missing:

When the server cannot process the request due to a missing unsupported extension, the web server sends this code to the user.

How to Solve These Common Problems?

You can solve these common problems yourself. Everyone, from beginner to experienced user, faces such proxy errors. These are common problems, so anyone can easily solve them. Here are a few steps to take to get rid of these proxy errors.

Reduce the Number of Requests:
When sending too many requests to a web server at the same time. The website considers too many requests suspicious. All you need to do is not panic and create some delay between sending a request to any web server.

Residential Proxies:
They are considered more expensive compared to other proxies. But they provide you with many proxies at the same time. You can rotate your IP more easily, and then there is less chance that the web server will block you.

Better Parsing Tools:
You perform all the steps, but you don't have a great data extraction tool. Then the likelihood of such errors increases. Therefore, it is recommended to use the best data extraction tool to avoid such errors.

Improve IP Rotation:
When you use a proxy management tool to rotate your IP address. By controlling IP rotation, you can reduce the number of requests from the same IP address.

Conclusion:

We have compiled this extensive list of the most common proxy error codes that users typically encounter when performing tasks related to web scraping or data extraction. Most of these proxy error codes usually appear when technical problems occur on the server or the user's server. The error can also occur on the proxy server side.

There are many HTTP error codes. But we have focused only on the most common ones. Users encounter these codes in their activities, and we have tried to provide possible solutions to obtain data from online sources without problems.