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Re: Detection of failed connection
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From: Ray Satiro via curl-library <curl-library_at_lists.haxx.se>
Date: Wed, 3 Jan 2024 03:32:08 -0500
On 1/3/2024 3:17 AM, Ali Nasir via curl-library wrote:
> I am trying to upload a file to an end point using multi interface.
> Example code used is https://curl.se/libcurl/c/postit2.html
> However, i see that when the server is down, there is no error
> reported from any of the curl interfaces.
>
> If i perform the same operation via the curl command from the shell, i
> get the return code as 7. But all the multi interfaces like info_read
> and mulit_perform return CURLE_OK.
> Can anyone guide how to detect failures with libcurl. Specially when
> the server is down.
That example uses curl_easy_perform not curl_multi_perform so there must
be some changes that you made. curl_multi_info_read should return the
transfer result code (CURLcode) in data.result. [1][2]
Also you could enable verbose mode to see if that's how the transfer is
actually failing. [3]
[1]: https://curl.se/libcurl/c/curl_multi_info_read.html
[2]: https://curl.se/libcurl/c/libcurl-errors.html
[3]: https://curl.se/libcurl/c/CURLOPT_VERBOSE.html
Date: Wed, 3 Jan 2024 03:32:08 -0500
On 1/3/2024 3:17 AM, Ali Nasir via curl-library wrote:
> I am trying to upload a file to an end point using multi interface.
> Example code used is https://curl.se/libcurl/c/postit2.html
> However, i see that when the server is down, there is no error
> reported from any of the curl interfaces.
>
> If i perform the same operation via the curl command from the shell, i
> get the return code as 7. But all the multi interfaces like info_read
> and mulit_perform return CURLE_OK.
> Can anyone guide how to detect failures with libcurl. Specially when
> the server is down.
That example uses curl_easy_perform not curl_multi_perform so there must
be some changes that you made. curl_multi_info_read should return the
transfer result code (CURLcode) in data.result. [1][2]
Also you could enable verbose mode to see if that's how the transfer is
actually failing. [3]
[1]: https://curl.se/libcurl/c/curl_multi_info_read.html
[2]: https://curl.se/libcurl/c/libcurl-errors.html
[3]: https://curl.se/libcurl/c/CURLOPT_VERBOSE.html
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