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Asked: 2024-09-25T01:39:49+05:30

I’m encountering an issue where my curl command is returning an HTTP 0.9 response, even though I have nghttp2 installed on my system. Can anyone provide guidance on how to resolve this problem?

I’m running into a really frustrating issue with my curl command, and I could use some help from anyone who’s dealt with this before. So, here’s the situation: my curl command is returning an HTTP 0.9 response! I thought I was doing everything right, but clearly, something’s off.

For context, I’ve got nghttp2 installed on my system, which I thought would help me work well with HTTP/2. I’ve tried hitting a couple of different URLs that I know are using HTTP/2, but I just keep getting this weird HTTP 0.9 response back. It’s like it’s not recognizing the newer protocol or something. I mean, I didn’t think it would be this complicated to get curl set up for modern web standards!

I’ve gone through the man pages and double-checked my curl version; it’s up to date, and nghttp2 shows as installed in my system. I’ve even tried using the `–http2` flag in my curl command, but it seems to ignore it entirely and falls back to this archaic HTTP 0.9. What gives? Is there a configuration setting I’m missing, or is there something specific I need to do to make sure curl recognizes that I want to use HTTP/2?

I also considered the possibility that maybe there’s an issue with the server I’m trying to reach, but that doesn’t explain why my curl would revert to HTTP 0.9.

I’d really appreciate it if anyone could share their insights or troubleshooting steps. Have any of you faced a similar problem? What did you do to fix it? I really don’t want to be stuck in this 0.9 response limbo forever! Any help would be awesome – I’m starting to lose my mind over this!

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    2 Answers







    1. Curl HTTP/2 Issue

      Help with Curl Returning HTTP 0.9

      Sounds really frustrating! It seems like you’re hitting a roadblock trying to work with HTTP/2 using curl. Here are a few things that might help you troubleshoot the issue:

      1. Ensure Curl is Built with HTTP/2 Support

      Check if your curl is actually built with HTTP/2 support. You can verify this by running:

      curl -V

      Look for “HTTP2” in the features list. If it’s missing, you may need to reinstall curl with HTTP/2 support.

      2. Double-check the Command

      Make sure your curl command includes the `–http2` option. Also, try the `-i` option to get the response headers as well:

      curl --http2 -i https://your-url-here

      3. Test with Different URLs

      Try running your command with a few different URLs that you know for sure support HTTP/2, like:

      curl --http2 -i https://www.example.com

      4. Check Your Server’s Configuration

      If the server doesn’t properly support HTTP/2, it might cause your curl to revert to HTTP/0.9. You could use tools like SSL Labs to test server support for HTTP/2.

      5. Update Your Installation

      Make sure that your installation of nghttp2 and curl is fully updated. Sometimes, issues arise from outdated dependencies.

      6. Inspect Your Network

      Finally, if nothing else works, some network configurations, proxies, or firewalls might also interfere. Try connecting from a different network to see if it changes anything.

      Don’t lose hope! A lot of developers hit similar snags, and it’s all part of the learning process. Keep experimenting, and you’ll get it sorted out!


    2. The issue you’re facing with receiving an HTTP 0.9 response using cURL is indeed perplexing, especially since you’ve taken steps to ensure that your environment is set up for modern web standards with nghttp2 installed. HTTP 0.9 is an outdated protocol and should not be used by modern applications or servers. The first thing you should double-check is the syntax of your cURL command. Ensure that you’re using the correct flags, particularly the `–http2` option, which explicitly tells cURL to use HTTP/2. It’s also important to verify the target URL; some servers, even if they support HTTP/2, may not be configured to respond to it properly or might degrade to older protocols when certain conditions are met, such as missing HTTP/2-enabled components or options on the client side.

      If you’ve verified that your cURL command is set up correctly and you’re still encountering the issue, consider looking into cURL’s verbosity options. Running your command with the `-v` flag can provide additional context about the request and response, helping identify where the fallback to HTTP 0.9 is occurring. It’s also worth checking the cURL version using `curl –version` to ensure it lists HTTP/2 support, along with confirming the SSL backend used (like OpenSSL), as HTTP/2 typically requires a secure connection. If everything appears in order but the problem persists, it may be beneficial to attempt connecting to different servers that explicitly support HTTP/2 to rule out server-side issues. In some cases, reinstalling cURL with the correct HTTP/2 support options can help resolve unseen configuration glitches.