If you’re getting Error Code 52, you’re likely experiencing a zero-length response from the server. This error may be caused by a violation of HTTP standard. You can try a free HTTP test tool to see whether your error is reproducible. If it is, there are a few possible causes.
Error code 52
An empty reply from the server error code means that the server is not responding to an HTTP request. This is a common problem and can be caused by a number of factors including network infrastructure, timeouts, devices, and servers such as nginx or Safari. Luckily, there are a few simple steps you can take to fix this problem.
Zero-length response received
You may have received a Zero-length curl 52 response from your server when your request was incomplete. This can occur when your request included a wrong or missing header. For example, if your request included a missing header called X-Missing-Field, the result will be a bad request (400 status code). In that case, you may want to use the CONTROL+C command to stop the server and try it again.
In this case, curl is not able to access the target URL because the application told it to abort the operation. You may need to specify an alternative proxy to access the target URL. To specify an alternative proxy, you can use the protocol:// prefix. This will make your proxy appear as HTTPS when the server replies.
You may also want to set a maximum transfer rate by using the curl option. This is useful if you have limited pipes. The maximum rate is specified in bytes per second. You can also specify kilobytes, megabytes, or gigabytes to change the maximum rate.
HTTP standard violation
When curl attempts to perform a request to a web server, it can encounter an HTTP standard violation, an empty reply from the server. This happens when curl tries to do plain HTTP on an HTTPS server. This error is a result of network infrastructure. The solution is to contact your web server administrator and ask them to fix the problem.
HTTP/1.1 servers SHOULD include Last-Modified in their response. This header field is used to indicate the current internal state of a virtual object. The value of the field is an absolute URL. If the URL in the response contains a CRLF, this header is ignored.
This header field is not secure. It can leak information from other sources. It also exposes password management to other sources. If this information is sent to the server, it may be redirected to another source.
Reproducible with free HTTP test tool
To increase reproducibility in science, we need to make it easier for researchers to share their work with others. We can do this by providing easy-to-use tools that make it easy to share data and reproduce results. We can also invest in infrastructure to make reproducibility easier and more widespread.