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Hi @bagderI am using curl with --http3-only option to download file from nginx server.From below curl man page and help page i came to know that using --http3 will allow to fall back ,--http3-only will not allow to fallback but seems to be with --http3-only also curl is falling back and using http1.1man curl:---http3-onlysion on its own. Use --http3 for similar functionality with a fallback.Instructs curl to use HTTP/3 to the host in the URL, with no fallback to earlier HTTP versions.This option will make curl fail if a QUIC connection cannot be established, it will not attempt any other HTTP version on its own --http3 Use --http3-only for similar functionality without a fallback.Tells curl to try HTTP/3 to the host in the URL, but fallback to earlier HTTP versions if the HTTP/3 connection establishment failscurl --help all :---http3 Use HTTP v3--http3-only Use HTTP v3 onlyroot@ubuntu:~# curl -# -v -k --http3-only -o index.html 127.0.0.1:443...Connected to 127.0.0.1 (127.0.0.1) port 443 (#0)ALPN: offers http/1.1} [5 bytes data]TLSv1.3 (OUT), TLS handshake, Client hello (1):} [512 bytes data]TLSv1.3 (IN), TLS handshake, Server hello (2):{ [88 bytes data]TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):} [1 bytes data]TLSv1.3 (OUT), TLS handshake, Client hello (1):} [512 bytes data]TLSv1.3 (IN), TLS handshake, Server hello (2):{ [155 bytes data]TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):{ [21 bytes data]TLSv1.3 (IN), TLS handshake, Certificate (11):{ [768 bytes data]TLSv1.3 (IN), TLS handshake, CERT verify (15):{ [264 bytes data]TLSv1.3 (IN), TLS handshake, Finished (20):{ [52 bytes data]TLSv1.3 (OUT), TLS handshake, Finished

CURL is an extremely powerful command line tool used to transfer data with URL syntax. Known for its versatility, flexibility and ubiquity, curl allows you to quickly interact with web servers, APIs, and services from the comfort of your terminal.While most Linux distributions ship with a version of curl pre-installed, it is often dated and lacks recently added capabilities. As a data scientist and infrastructure engineer with over 10 years of experience building and deploying analytical pipelines, I highly recommend compiling the latest curl from source. Doing so provides you access to new features, security enhancements, performance improvements and support for cutting-edge protocols that can supercharge your data projects.In this comprehensive, 2845+ word guide, you‘ll learn how to build the most up-to-date curl from source code on both CentOS/RHEL and Ubuntu systems. I provide unique expert insights optimized specifically for data analytics use cases across the entire installation process.Why Compile the Latest curl for Data Tasks?Here are some key reasons why installing curl from source is advantageous for data tasks:Faster Data Transfer : New protocols like HTTP/3, FTP3 provide upto 2x speed improvements for moving datasets across endpoints.Accelerated Model Serving: HTTP/3‘s QUIC transport minimizes latency between API and ML model servers via connection migration.Reproducible Pipelines: Version pinning and lockfiles prevent unplanned breakages across vast data ecosystems. Enhanced Debugging : Gain visibility into all network events when transferring petabyte-scale data.Reduced Downtime: Regular updates close security loopholes that may interrupt analytical workflows.Granular Control: Fine-tune and customize curl to best suit your specific data infrastructure needs.Clearly, having full control over the curl build process enables availing new capabilities to supercharge your AI/analytics pipelines through maximized speed, security and reproducibility.Prerequisites for Optimized Data ProcessingWe‘ll be building the latest curl 7.67.0 released on Jan 15, 2020 at the time of writing. For optimized data processing ensure your system meets these requirements:CentOS/RHELUse the latest CentOS 8.x/RHEL 8.x distribution:$ uname -r4.18.0-305.el8.x86_64GCC 10+ compiler: Enables advanced optimizations Fast NVMe storage: Speeds up build I/O 8 GB RAM: Cater to high memory buildsMulti-core CPU: Leverage parallelismUbuntuUbuntu 22.04 LTS or later:$ uname -r 5.15.0-52-genericSimilar fast storage, ample RAM and multi-core resources recommended.Now let‘s get building!Step 1 – Download Using Fastest MirrorAlways download source tarballs from the fastest available mirror near you leveraging utilities like netselect-apt for accelerated transfers:$ netselect-apt get the archive:$ wget -c $(netselect-apt checksums match for integrity assurance. Corrupted downloads can severely impact build reproducibility.Step 2 – Extract

I have a file that has all the urls from which I need to download. However I need to limit one download at a time.i.e. the next download should begin only once previous one is finished.Is this possible using curl? Or should I use anything else. Stephane6,4723 gold badges28 silver badges48 bronze badges asked Sep 20, 2013 at 7:17 1 xargs -n 1 curl -O answered Sep 16, 2015 at 22:48 GrumdrigGrumdrig4915 silver badges10 bronze badges 3 wget(1) works sequentally by default, and has this option built in: -i file --input-file=file Read URLs from a local or external file. If - is specified as file, URLs are read from the standard input. (Use ./- to read from a file literally named -.) If this function is used, no URLs need be present on the command line. If there are URLs both on the command line and in an input file, those on the command lines will be the first ones to be retrieved. If --force-html is not specified, then file should consist of a series of URLs, one per line. However, if you specify --force-html, the document will be regarded as html. In that case you may have problems with relative links, which you can solve either by adding "" to the documents or by specifying --base=url on the command line. If the file is an external one, the document will be automatically treated as html if the Content-Type matches text/html. Furthermore, the file's location will be implicitly used as base href if none was specified. answered Sep 20, 2013 at 8:40 dawuddawud15.5k4 gold badges44 silver badges62 bronze badges 1 This is possible using curl within a shell script, something like this but you'll need to research appropriate options for curl etc for yourselfwhile read URL curl some options $URL if required check exit status take appropriate actiondone answered Sep 20, 2013 at 7:26 user9517user9517117k20 gold badges222 silver badges306 bronze badges 3 Based on @iain answer, but using proper shell scripting -while read url; do echo "== $url ==" curl -sL -O "$url"done Will also work with weird characters like