Discuss the problem of incomplete cURL reading in PHP and its solutions

PHP cURL is a tool used for data transmission with the server. It supports many protocols, including HTTP, HTTPS, FTP, etc. However, sometimes there will be incomplete reading problems, resulting in unrequested requests or long delays. time to return the result. This article will discuss the problem of incomplete cURL reading in PHP and its solutions.

Problem description

Incomplete reading means that when using PHP cURL to send a request, the content length of the returned response is not equal to the expected length, maybe a part is missing Data or complete loss of data. This problem can also manifest itself as a slow connection.

Cause of the problem

There are many reasons for the incomplete reading of PHP cURL. The following are some common reasons:

1. Server response time Too long or timeout

When the server spends a lot of time processing the request, the problem of incomplete reading will occur. This problem is particularly common in large-scale or complex applications.

2. The server closed the connection

Sometimes, the server can close the connection directly after processing the request. This prevents cURL from getting the required data.

3. The server sends the response in chunks

When the server sends the response, it may send the data in chunks. cURL may not receive these chunks completely, resulting in incomplete data.

4. PHP memory limit

When the process mounted by the PHP script exceeds the memory quota, cURL will be forcibly closed, resulting in incomplete reads.

5. Status code return error

If the status code returned by the remote server is an error status code such as 404, 503, etc., cURL will process this, which may result in data loss. .

Solution

1. Increase cURL timeout

You can use the CURLOPT_TIMEOUT and CURLOPT_TIMEOUT_MS options in the curl_setopt() method to increase Timeout for cURL requests.

CURLOPT_TIMEOUT is the time limit in seconds, CURLOPT_TIMEOUT_MS is the time limit in milliseconds. You can set an appropriate timeout according to your own needs.

2. Increase the connection waiting time

You can use the CURLOPT_CONNECTTIMEOUT and CURLOPT_CONNECTTIMEOUT_MS options in the curl_setopt() method to increase the connection waiting time.

The CURLOPT_CONNECTTIMEOUT option is the time limit in seconds and CURLOPT_CONNECTTIMEOUT_MS is the time limit in milliseconds. Similarly, you can set the appropriate connection waiting time according to your own needs.

3. Determine whether all the data has been received

You can use the curl_multi_exec() method to determine whether all the response data has been received. If the data has not been completely received, call the curl_multi_exec() method repeatedly.

4. Fix chunked data

If the data is chunked, you can use the CURLOPT_ENCODING option to fix the problem. This option tells PHP cURL that the data is transferred using the chunked protocol, allowing it to automatically reassemble the data.

5. Increase the memory quota

You can increase the memory quota by setting the memory_limit in the php.ini file or using the ini_set() method in the PHP script.

Conclusion

PHP cURL is a very powerful tool, but there are some issues that need to be paid attention to when using it. Underreads are a common problem, but can be solved with the solutions mentioned above. I hope everyone will pay attention when using cURL to avoid unnecessary trouble.

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