cURL command

This article deeply analyzes the technical details and advanced application scenarios of cURL sending GET requests, and combines IP2world proxy services to provide a complete solution from basic syntax to enterprise-level applications.1. cURL core working mechanism and engineering valueAs a cross-platform network transmission tool, cURL's GET request processing involves three core modules: TCP connection management, protocol stack interaction, and data analysis. With the support of the IP2world proxy service system, cURL can break through the limitations of traditional networks and achieve:Cross-border API debugging: accessing region-restricted interfaces through geolocation proxiesDistributed data collection: Cooperate with IP pool to achieve load balancing of millions of requestsSecurity audit penetration: bypassing corporate firewalls for white hat security testingTypical request processing flow:graph TDA[Command analysis] --> B[DNS analysis]B --> C [TCP handshake]C --> D[SSL/TLS Negotiation]D --> E [HTTP request construction]E --> F[Proxy server relay]F --> G[Response analysis]2. Basic to Advanced cURL GET Request Technology Implementation1. Basic request structurecurl -X GET "https://api.example.com/data?id=123" \-H "Authorization: Bearer token123" \-H "User-proxy: Mozilla/5.0"Key parameter analysis:-X GET: explicitly declare the HTTP method (optional)-H: Request header injection for identity authentication and traffic disguise--compressed: Enable brotli/gzip compressed transmission2. Proxy Integration Solutioncurl -x "http://user:[email protected]:8080" \--proxy-ntlm \"https://target-site.com"IP2world proxy service technical support:Protocol adaptation: support HTTP/HTTPS/Socks5 proxy protocolAuthentication integration: NTLM/Basic/Digest authentication mode automatic negotiationConnection pool optimization: TCP Keep-Alive maintains long connection reuse3. Advanced debugging techniquescurl -v \--trace-ascii debug.log \--limit-rate 100K \--retry 5 \--retry-delay 10 \"https://api.example.com"Engineering-level parameter combination:-v: Completely output request/response header information--retry: Intelligent retry mechanism when network fluctuates--limit-rate: bandwidth limit to avoid triggering QPS threshold3. Technical Challenges and Breakthroughs in Enterprise-Level Applications1. Large-scale request schedulingDistributed execution framework:# Using GNU Parallel to implement concurrency controlparallel -j 50 curl -x "socks5://{}.ip2world.com:1080" \"https://api.com/items/{}" ::: {1..10000}Performance optimization indicators:The number of concurrent connections per node can reach 1024 (need to adjust --max-concurrent)Connection reuse rate increased to 85% (through Keep-Alive optimization)2. Anti-climbing strategycurl -H "X-Forwarded-For: 203.0.113.45" \--dns-servers 8.8.8.8 \--interface eth0:1 \--ssl-no-revoke \"https://target.com"Key defense breakthrough points:IP2world dynamic residential proxy rotation (change IP every minute)TLS fingerprint obfuscation (--tlsv1.3 --ciphers DEFAULT@SECLEVEL=1)Clock drift simulation (--header "Date: $(date -R -d '30 min ago')")3. Data collection integrity assurancecurl -C - \--etag-compare etag.txt \--etag-save etag.txt \--time-cond "Wed, 05 Mar 2025 00:00:00 GMT" \-o data.json \"https://api.example.com/dataset"Incremental update mechanism:Resume download (-C -) to ensure large file transferETag verification implements data version controlTime condition request to filter historical data4. Performance Optimization in Engineering Practice1. Connection layer optimizationcurl --tcp-fastopen \--tcp-nodelay \--resolve api.example.com:443:203.0.113.1 \"https://api.example.com"Key technical parameters:TCP Fast Open reduces handshake RTTDisabling Nagle algorithm improves real-time performanceDNS pre-resolution bypasses query delays2. Memory and CPU efficiencycurl --raw \--no-buffer \--max-time 30 \--output /dev/null \"https://streaming-api.com"Resource control strategy:Raw stream processing to avoid memory bufferingTimeout fuse to prevent zombie connectionsOutput redirection reduces I/O consumption3. Automated monitoring system#!/bin/bashwhile true; dolatency=$(curl -w "%{time_total}\n" -o /dev/null -s "https://api.com")if (( $(echo "$latency > 2.0" | bc -l) )); thenecho "$(date): High latency warning ($latency seconds)" >> monitor.log# Automatically switch IP2world backup proxysed -i 's/proxyA.ip2world.com/proxyB.ip2world.com/' config.inifisleep 60done5. Deep integration with IP2world proxy service1. Intelligent IP dispatching system#!/bin/bashAPI_KEY="ip2world_api_key_123"PROXY_LIST=$(curl -s "https://api.ip2world.com/proxy/list?key=$API_KEY&protocol=socks5")for proxy in $(echo $PROXY_LIST | jq -r '.proxies[]'); docurl -x "socks5://$proxy" \--fail-early \--max-time 10 \"https://target-site.com" && breakdone2. Enterprise-level security configurationcurl --proxy-cacert ip2world_ca.pem \--proxy-cert-type P12 \--cert client.p12:password123 \--proxy-tlsv1.2 \--proxy-tls13-ciphers TLS_AES_256_GCM_SHA384 \-x "https://enterprise-proxy.ip2world.com:3128" \"https://bank-api.com"3. Traffic analysis and auditingcurl --trace-time \--trace-ids \--aws-sigv4 "aws:amz:eu-west-1:es" \-H "X-IP2World-Request-ID: $(uuidgen)" \-X GET \"https://logs.ip2world.com/audit" As a professional proxy IP service provider, IP2world provides a variety of high-quality proxy IP products, including dynamic residential proxy, static ISP proxy, exclusive data center proxy, S5 proxy and unlimited servers, suitable for a variety of application scenarios. If you are looking for a reliable proxy IP service, welcome to visit IP2world official website for more details.