Troubleshooting of curl errors
cUrl "is used in command lines or scripts to transfer data."[1] (alternative library to achive sampe purpose: (1) PHP naive Client URL Library (2) cURL class for PHP (3) Installing cURL on Cygwin on Windows)
Contents
- 1 How to resolve cUrl error (#5): Unsupported proxy syntax
- 2 How to resolve cUrl error (#56): OpenSSL SSL_read: No error.
- 3 How to resolve Error 405 Method Not Allowed
- 4 How to resolve Error 415 Unsupported Media Type
- 5 How to rseolve cURL returns binary data instead of html or json
- 6 How to resolve the downloaded file was empty
- 7 Further reading
- 8 References
How to resolve cUrl error (#5): Unsupported proxy syntax[edit]
Condition: the username of socks5 proxy contains @ symbol such as [email protected]
curl_setopt($ch, CURLOPT_PROXY, 'socks5://username:[email protected]:12345'); // result is ok curl_setopt($ch, CURLOPT_PROXY, 'socks5://[email protected]:[email protected]:12345'); // met cUrl error (#5): Unsupported proxy syntax
Solution: Escape the special symbol[1] using URL Encode and Decode - Online or urlencode function
curl_setopt($ch, CURLOPT_PROXY, 'socks5://bob%40email.com:[email protected]:12345'); // result is ok
How to resolve cUrl error (#56): OpenSSL SSL_read: No error.[edit]
Condition: The curl vesion 7.67.0 on windows met problem. Result of curl_version returned:
version: Array
(
[version_number] => 475904
[age] => 5
[features] => 2953117
[ssl_version_number] => 0
[version] => 7.67.0
[host] => x86_64-pc-win32
[ssl_version] => OpenSSL/1.1.1d
[libz_version] => 1.2.11
)
Solution: Use other version of curl command or curl on Cygwin or cURL class for PHP.
Related articles
How to resolve Error 405 Method Not Allowed[edit]
When I tried to crawl the web resource but met the error message: "Error 405 Method Not Allowed"
Solution: Make sure using the correct HTTP request method[2] e.g. GET or POST to access the web resource.
How to resolve Error 415 Unsupported Media Type[edit]
When I tried to POST JSON (as payload) but met the error message: "Error 415 Unsupported Media Type"
Solution: Set the cUrl with the header Content-Type: application/json[3] Example syntax of cUrl command as following:
curl -X POST --header "Content-Type: application/json" --data '{"user" : "your_user_name", "token" : "your_token"}' "https://example.com/"
How to rseolve cURL returns binary data instead of html or json[edit]
How to resolve the downloaded file was empty[edit]
Error condition
- When I executed the Curl command curl -O https://path/to/plain_text.txt, but the downloaded file was empty.
Solution
- After I enabled verbose option, I found the HTTP status code HTTP/1.1 302 Moved Temporarily. I added the location (-L) parameter to resolve the downloaded file was empty: curl -L -O https://path/to/plain_text.txt,
The truncated result after executed the command: curl -v -O https://path/to/plain_text.txt < HTTP/1.1 302 Moved Temporarily < Server: nginx < Date: Tue, 25 Aug 2020 03:45:13 GMT < Content-Type: text/html < Transfer-Encoding: chunked < Connection: keep-alive < Keep-Alive: timeout=60 < Location: /path/to/plain_text.txt
Further reading[edit]
References[edit]
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