curl
curl is an open-source command-line tool and network transfer library that supports data transfer over dozens of network protocols, including HTTP, HTTPS, FTP, and SMTP. It is widely used for sending network requests, uploading and downloading files, and debugging APIs. It provides cross-platform support, and its underlying library, libcurl, can be called by multiple programming languages and applications, making it a foundational tool in network development and operations.
Timeline (last 90 days)
The macOS command-line argument limit is about 1 MB (ARG_MAX), so curl uses -d @- to read the request body from stdin, and jq uses --rawfile together with process substitution to handle large file output.
Using the command curl -s https://your-site.com | wc -c, if the response is only a few hundred bytes you have an empty shell, and if it reaches several thousand bytes or more the content is in the HTML.
GoRoute offers two installation methods: via a curl script and via npx goroute.
In differential testing, a non-zero curl exit should fail the case outright, because two identical errors look like a match to the diff.
When installing Claude Code, use the curl command on Mac/Linux/WSL, and PowerShell or CMD on Windows.
When doing a first round of crawling of public pages, you can use curl to save response headers and body separately, recording the final URL, status code, number of redirects and total time, but that request does not run JavaScript, does not simulate Googlebot, and cannot prove which canonical page Google chose.
You can compare the status codes returned by curl when requesting the homepage with a Mozilla browser user agent versus an OAI-SearchBot user agent to determine whether server behavior is consistent with robots.txt: a browser getting 200 and a crawler getting 403 indicates that a CDN or WAF layer rule is at work.
curl is an open-source project initiated by Daniel Stenberg in 1996, and its name means Client URL, relying on the libcurl library to make network requests.
The difference between Fancy Curl Sites and text browsers is that it directly reuses curl's request pipeline, requires no additional installation of browser-level binaries, and lowers distribution and onboarding costs.
curl is preinstalled on almost all Unix-like systems, macOS, and Windows versions after Windows 10.
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All Facts (20)
最近一次被评为HIGH级别的curl CVE（CVE-2023-38545）发布于2023年10月
95%Unverifiedcurl诞生于1998年，由Daniel Stenberg以一个名为httpget的小工具为起点发展而来
95%Unverifiedcurl和Python requests库的TLS握手签名与Chrome浏览器截然不同，容易被反爬系统识别
90%Unverifiedcurl项目将每个选项拆分为独立的.d文件，存放在docs/cmdline-opts/目录下，由构建脚本自动聚合生成最终的man page和网站文档
90%Unverifiedcurl有超过240个命令行选项
90%UnverifiedAndroid系统、macOS、几乎所有Linux发行版均内置curl
90%Unverifiedcurl支持多达30余种网络协议，包括HTTP、HTTPS、FTP、SMTP、IMAP等
85%Unverifiednpm、pip、curl等CLI工具同样依赖环境变量而非系统代理API来获取代理设置
85%Unverified全球超过100亿台设备上运行着curl
75%UnverifiedThe curl project operates a bug bounty program through the HackerOne platform.
60%UnverifiedCurl has been installed more than 20 billion times and runs on virtually every smartphone, tablet, car, television, game console, and server.
60%UnverifiedDaniel Stenberg has maintained curl for more than 25 years.
60%UnverifiedThe macOS command-line argument limit is about 1 MB (ARG_MAX), so curl uses -d @- to read the request body from stdin, and jq uses --rawfile together with process substitution to handle large file output.
50%UnverifiedUsing the command curl -s https://your-site.com | wc -c, if the response is only a few hundred bytes you have an empty shell, and if it reaches several thousand bytes or more the content is in the HTML.
50%UnverifiedGoRoute offers two installation methods: via a curl script and via npx goroute.
50%UnverifiedIn differential testing, a non-zero curl exit should fail the case outright, because two identical errors look like a match to the diff.
50%UnverifiedWhen installing Claude Code, use the curl command on Mac/Linux/WSL, and PowerShell or CMD on Windows.
50%UnverifiedWhen doing a first round of crawling of public pages, you can use curl to save response headers and body separately, recording the final URL, status code, number of redirects and total time, but that request does not run JavaScript, does not simulate Googlebot, and cannot prove which canonical page Google chose.
50%UnverifiedYou can compare the status codes returned by curl when requesting the homepage with a Mozilla browser user agent versus an OAI-SearchBot user agent to determine whether server behavior is consistent with robots.txt: a browser getting 200 and a crawler getting 403 indicates that a CDN or WAF layer rule is at work.
50%UnverifiedThe difference between Fancy Curl Sites and text browsers is that it directly reuses curl's request pipeline, requires no additional installation of browser-level binaries, and lowers distribution and onboarding costs.
50%