Curl multiple connections. However, running `curl` commands sequentially can be painfully slow, especially when dealing with multiple requests. Globalping is a platform that allows anyone to run networking commands such as ping, traceroute, dig, curl and mtr on probes distributed all around the world. Nov 25, 2016 · Ive already tried using aria2 but its limited to 16 connections, lftp doesn't have any protection against stalled transfers. Our goal is to provide a free and simple service for everyone out there to make the internet faster. Mar 8, 2012 · I'd like to use cURL to test flood handling on my server. Learn how to send multiple curl requests sequentially or concurrently with practical examples and best practices for API testing. Sep 22, 2017 · I thought that reusing same TCP connection will be faster so curl --parallel should be faster than xargs -P n, But I found xargs is faster with connection: close for each request! May you describe Why please? Does curl see the parallelized jobs and reuse the same connection? No all the connections on a single curl_multi handle operate on the same thread. This can potentially lower the total amount of connections (and thereby resources) necessary, but it might be slightly slower at start-up. - curl-bench. Feb 4, 2025 · Learn how to use Multi cURL in PHP to handle multiple requests simultaneously. May 7, 2021 · In this way, I hope to observe that the server will receive multiple http2 requests at almost the same time over the same connection, after 10 seconds, the client will receive responses. I wanted curl to use one session, so I needed to call it once. To process cURL in parallel or sequentially we can use: * xargs * parallel * for loop in bash * seq You can find several examples below: Let's discuss in more detail how to send concurrent requests with cURL. Beta: Files API: Upload and manage files for use across multiple API calls (POST /v1/files, GET /v1/files) Skills API: Create and manage custom agent skills (POST /v1/skills, GET /v1/skills) For the complete API reference with all endpoints, parameters, and response schemas, explore the API reference pages listed in the navigation. I'd like to now do the same thing, except instead of one request, I want to generate at least 10 requests at once. Feb 9, 2021 · Initially I called curl for each one, but that was too slow due to close/open the connection multiple times. For example, if you need to query 10 APIs each taking 2 seconds to respond Mar 13, 2024 · To send request in parallel using cURL command line client the -Z or --parallel option can be used and mixed with other config options. 1. Boost performance and optimize API calls with efficient cURL handling. In this comprehensive guide, you will learn various methods to execute multiple curl requests in parallel to boost throughput, simulate loads, and gain performance insights. How would I do this? In earlier HTTP versions, the client would either have to create multiple connections or do the transfers in a serial manner, one after the other. It uses a single select/poll/epoll event loop and non-blocking sockets to process all the connection concurrently on the same thread. Nov 6, 2023 · Running curl commands sequentially may not cut it if you need hundreds or thousands of concurrent requests. curl attempts to reuse connections when doing multiple transfers, so that getting many files from the same server do not use multiple connects and setup handshakes. I'm wondering if its possible to download one file with multiple connections using curl cli. Another crucial method not mentioned here is using the same TCP connection for multiple HTTP requests, and exactly one curl command for this. Jan 4, 2026 · In the world of shell scripting and automation, `curl` is a ubiquitous tool for making HTTP requests—whether you’re testing APIs, downloading files, scraping web pages, or monitoring endpoints. Connection before multiplex When curl is asked to do parallel transfers, it prioritizes having the additional transfer reuse and multiplexing happen over pre-existing connections. However,I noticed that the server received the requests sequentially. example. Right now I'm using this on a Windows command line: curl www. Download specified files in X number of threads using curl to simulate multiple connections. This is very useful to save network bandwidth, client and server resources, and overall the need of using multiple curl commands, as curl by default closes the connection when end of command is reached. Feb 17, 2023 · In this article, you can find how to run multiple cURL commands in parallel. libcurl supports HTTP multiplexing for both HTTP/2 and HTTP/3. com which will GET the page once. cURL: multiple POST requests while reusing the TCP connection Ask Question Asked 12 years, 4 months ago Modified 6 years, 7 months ago Connection before multiplex When curl is asked to do parallel transfers, it prioritizes having the additional transfer reuse and multiplexing happen over pre-existing connections. wgrc avwogy mjfo clyg fqjnz eupby jbrgdgf rlhgkyx rbwa yoqco