Editing Troubleshooting of curl errors (section)

=== How to Suppress the Progress Meter ===
When executing the curl command, the typical output includes detailed information about the download and upload process as shown below:
<pre>
% curl -o sample.pdf https://example.com/sample.pdf

 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 90141  100 90141    0     0  20029      0  0:00:04  0:00:04 --:--:-- 22012
</pre>

To suppress the progress meter of the curl command, you can use the {{kbd | key=<nowiki>-s</nowiki>}} (silent) option, which hides all output, or the {{kbd | key=<nowiki>-S</nowiki>}} (silent with error messages) option, which suppresses the progress meter but still displays error messages.
<pre>
curl -sSo file.pdf [URL]
</pre>

Alternatively, if you prefer to suppress all output including error messages, use the {{kbd | key=<nowiki>-s</nowiki>}} (silent) option alone:
<pre>
curl -so file.pdf [URL]
</pre>

Suggestion:
<pre>
curl -sSfo file.pdf [URL]
</pre>
Adding {{kbd | key=<nowiki>-f</nowiki>}} causes curl to fail on HTTP errors (4xx, 5xx), making it the most robust option for scripts.

<table class="wikitable sortable">
      <tr>
        <th>Flag</th>
        <th>Error type caught</th>
      </tr>
      <tr>
        <td><span class="flag">-S</span></td>
        <td>Network-level errors (DNS failure, connection refused)</td>
      </tr>
      <tr>
        <td><span class="flag">-f</span></td>
        <td>HTTP-level errors (4xx, 5xx)</td>
      </tr>
      <tr>
        <td><span class="flag">-sS</span></td>
        <td>Silent + network errors</td>
      </tr>
      <tr>
        <td><span class="flag">-sSf</span></td>
        <td>Silent + network errors + HTTP errors</td>
      </tr>
  </table>