We definitely understand your feelings when your online scraping task suddenly finishes producing a number similar to an http error code. Is there something wrong with your default settings or the proxy itself? Normally, such errors occur if proxies are mismanaged and knowing the meaning of the error prompts you to solve such specific problem.
In this guide, we've compiled a list of the most common proxy errors to show you when and why you might get them. You will be able to learn proxy error meanings and discover some recommended actions that will help you overcome such errors.
What is Proxy Error?
So, what does proxy error mean in general? When a request you send to a web server through a proxy fails, it causes an http error code on the server side. Since it is vital for you to continue using the proxy, you need to be aware of its meaning to understand such error code and take further precautions. Now let's take a look at the "understanding" part before getting to the "actions" part. Proxy codes come in three digits, with the first representing the error class. The total number of courses is five.
Classes of Proxy Error Codes
1xx – Informative Error Codes
This class of error codes is rarely used and indicates the status of requests being processed by a proxy.
2xx – Success Error Codes
Indicates that the proxy server you are using successfully processed the operation.
3xx – Redirect Error Codes
Indicates that an additional action is required on the client side to perform the requested operation.
4xx – Client Error Codes
These codes indicate that the error is generated on the client side (in the request syntax, Internet browser, or automation bot).
5xx – Server Error Codes
This type of error occurs when the server cannot successfully process the request received from the proxy.
Detailed Description of Proxy Errors and Possible Solutions
1xx – Informative Error Codes
Before giving you a detailed description of such codes, we must say that they occur rarely and indicate that the server is processing requests received from the proxy.
100 – Continued
This code indicates that the request has been partially received and the remaining
This is an indication that the portion is now expected to be sent through the proxy. Normally, it is executed via an intermediary code request by sending "expect: 100 - continue" in the header. Once 100 is received, the rest of the body can be submitted.
101 – Switching Protocols
This server's status code means that the browser (Chrome, Firefox, etc.) wants to change the current data transfer protocol. Once the protocol key is validated and validated, the client's browser sends the HTTP status code "100 – Switching Protocols".
102 – Processing (WebDAV extension)
With this code, the target web server indicates that it needs more time to process the current request. In the case of a series of subrequests sent from the client's browser using WebDAV, the server will eventually respond with the "102 – Processing" code, indicating that it needs more time to complete the current requests.
103 – Early Hints
With this code, the web server signals to the browser early that it has not yet started processing requests.
2xx – Success Error Codes
Error codes in this range (200 to 299) indicate that the web server received the request through your proxy and received a response. The most frequently received code here is 200, which indicates that the request was fulfilled successfully. However, if you get a different code, it could mean some kind of error that needs your attention.
201 – edited
The target web server generates this code to indicate that a new resource has been created in response to a request. This means that the server uses the original request as the starting point for the next response. This code is often used when authenticating with a server requesting a username and password.
202 – Accepted
This code is used to indicate that the server has received the request but has not yet processed it. Please note that this is only an indication that the request has been accepted and does not mean that processing is complete.
204 – No Content
This code indicates that the server could not find any content to satisfy the request.
205 – Reset Content
This code is similar to code 204 when no content is found. The difference here is that this code asks for the content view to be reset by the client.
206 – Partial Content
This code means that the content received from the target server only partially matches the content requested from the header. This can happen when a number of files are requested and only some are received.
3xx – Redirect Error Codes
3xx redirect codes indicate that some additional processing is needed on the client side. If you use your own scripts to run proxies, you need to pay special attention to these scripts.
300 – Multiple Choice
Now this code indicates that the request is routed to more than one destination.
If your scraper or crawler cannot decide what data to retrieve, you will receive this error code. To fix this issue, make sure your proxy points to a single source for data retrieval.
301 – Permanently Transported Resource
This code is received when the targeted URL redirects to a different URL.
When search engine crawlers are involved, they can handle up to 5 redirects for one URL. After that you will revert this error to avoid an infinite loop.
This is by far the most common 3xx error code.
302 – Resource Moved Temporarily
Error code 302 indicates that a temporary redirect to the intended URL has been set. This means that when your request goes through, it will be redirected to another URL.
4xx – Client Error Codes
The most frequently occurring errors transmitted to the client are codes 4xx and 5xx. If you receive a 4xx error code, it means the error occurred on the client side (in the request, the browser, or your bot).
400 – Bad Request
This code means that the proxy cannot parse the incoming request.
401 – Unauthorized
This code indicates that you are trying to access a resource that requires authentication. Basically, you cannot connect to the proxy server properly. Simply provide the correct username and password to ensure credentials are recognized and resolve this connection issue.
402 – Payment Required
Now this is a rare code reserved for future use. It is meant to indicate the presence of a digital payment system on the targeted site.
404 Not Found
This code indicates that the targeted resource could not be found, even if the request was actually valid. Normally, it is a result of dead links, meaning that the original source has been removed or modified without proper redirection.
405 – Forbidden Method
This error code indicates that the method the user implemented for this particular request is not allowed.
407 – Proxy Authentication Required
One possible reason for the 407 status code to appear is incorrectly entering your proxy credentials (usernames, passwords) into your script or scraper. To resolve the 407 error code issue, you need to verify your proxy credentials and ensure that you have entered all the required information. Another possible cause could be whitelisting your device's IP with the proxies you use. Make sure it is in the list and contact your proxy provider if the problem persists.
429 – Too Many Requests
This error occurs when you send too many requests in a certain time period. The resource you are trying to access sees it as a botting activity and blocks you from accessing it. This situation can also be monitored by triggering a captcha in some of the resources equipped with an anti-bot security system.
One solution here would be to use rotating proxies with appropriately set delays between IP rotations for this particular resource.
5xx – Server Error Codes
The 5xx range of codes relates to errors that occur when the server receives the request but is unable to process it successfully.
A common solution to 5xx errors would be to automatically rotate proxy IPs (change the proxy network). These errors are less likely to occur when you use You also want to pay attention to the server locations you target.
500 – Internal Server Error
A 500 proxy error code is returned when an unexpected server condition occurs that stops the server from responding.
501 – Not implemented
This error indicates that the server cannot process the request properly due to some unsupported methods used in the request.
502 Bad Gateway
HTTP code 502 is returned when your proxy receives an invalid response from the target server.
The way to fix this problem will be to clear your cache and cookies. If the problem persists, try changing your DNS and using the system without a proxy.
503 Service Unavailable
The server targeted with proxy error 503 indicates that the current request cannot be resolved. Or it means the server is currently unavailable due to maintenance.
504 Gateway Timeout
This error condition occurs when your proxy cannot receive a timely response from the target. This may be because the request is still being processed and your proxy server cannot wait any longer. If this code keeps coming up, edit the timeout settings in the header of your proxy request or contact your proxy provider.
505 – HTTP Version Not Supported
This http proxy error code appears when your server does not support the HTTP version used in the request. To solve this problem, you can Buy HTTP proxy matching the version rather than the proxies you are currently running.
507 – Insufficient Space
This code means that the server you are trying to access is out of space and cannot process your request.
510 – Extensions Missing
This error code is returned when the server cannot process your request due to an unsupported extension requested.
Proxy Error Codes Specific to HızlıProxy
Static Proxy Error Codes
Our static proxy servers often use non-standard error codes to avoid conflicting with standard codes that might be returned by a real HTTP server. The only standard one is 407.
When an invalid HTTP proxy request is encountered, the server silently closes the connection.
The response with the errors returned has a special header, and the Server header looks like this: "Server: FaaS vX.X-XXXXXXXX-XXXXXXXXXX", where X is a number or a letter. The specific title is X-Request-Error.
Here is a list of error codes you may encounter:
407 Proxy Authentication Required – bad credentials or no credentials but no IP address on our system or an incorrect address was authorized. Note that changes made to credentials as well as authorized IPs immediately after the package is created take a few minutes to take effect. X-Request-Error does not exist in this case because this error is returned only by the proxy server.
451 Unavailable for Legal Reasons – means you are trying to connect to a site that does not currently have access to our system, or you are trying to access a blocked port on a host (allowed ports are 80, 443, and 2080, 2525, 3306, 5432, 6379, 9200, 9300 , everything greater than or equal to 1025, except 10000 and 11211). In this case, X-Request-Error equals TARGET_HOST_IS_BLOCKED. The response body will contain the reason why the request was blocked. This error is used instead of 403 because 403 may be returned by the target host. 451 may also be returned by the target host, but this is a rare error that is not generally used.
570 DNS Resolution Failed – The proxy server was unable to resolve the IP address of the target host because it does not have A DNS record or there is a problem with the authoritative DNS server on the host.
572 Target Host Connection Failed – the proxy server failed to connect to the target host. This usually means the host is down or is blocking the proxy IP with a firewall.
573 Target Host Communication Error – an error was encountered while sending a request or reading a response to the target host. This error is returned only for non-CONNECT requests.
529 Proxy Rate Limit Reached – your packet is sent when the number of connections to each proxy IP is limited. By default there is no such limit.
Backlink Proxy Error Codes
There are a few more errors with backlink proxies:
429 – Too Many Requests – You have reached the connection limit on this port. To distinguish this proxy error from a 429 that may be returned by a site, examine the body of the response, it should read "Backlink: too many requests received."
500 has 2 different meanings:
Response body: Connection to target proxy failed, retry the request. The backlink server was unable to establish a connection with the target proxy within the allotted time.
Response body: Your IP pool is empty, please contact support for options. Currently your package contains 0 proxy IPs in your pool. This can happen when you have an automated repository that is updated daily by our controllers.
Additionally, a 408 error is used if the backlink server cannot read a request within the allotted time.
Since the backlink uses our own static proxies to contact the target host, you may also see some errors like 403 and 503 from static proxies.
Suggestions on How to Fix Proxy Errors
Now that we've covered the most common proxy error codes, we can shed more light on how to fix proxy errors. One way is to use a special open source software tool called a proxy manager. With this administrator, you will be able to make certain adjustments, such as making timely updates to credentials and region information. This will help you avoid many mistakes.
The proxy manager also helps you schedule some actions to avoid errors. For example, you can use rolling residential proxies to resolve 403 error (Forbidden access). By adjusting rotations, you can manage to grant yourself access to an otherwise restricted website.
Now, let's look at some suggestions on how to avoid proxy errors.
Consider Using Residential Proxies
If you replace part of your data center with residential proxies, some improvement in reducing the number of errors may be detected. Although somewhat expensive, residential proxies are less likely to be detected. You can also successfully rotate them to avoid errors.
Reducing the Number of Requests
Websites are extremely careful about the number of requests your scraper or bot can send to them. If this number is too high, it will become suspicious and block your proxy's IP. The solution here would be to set a delay between requests to emulate a more human-like data access. Also, to further improve the situation, you should minimize the number of requests from the same IP.
Use Updated Tools
Now, all these recommendations will be invalid if you start using an unreliable scraper with poor performance. Please ensure that all your third-party tools hosting proxies are up to date and working as per your expectations to minimize the number of errors.
