How to send a GET request via cURL?

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 value

As 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 proxies

Distributed data collection: Cooperate with IP pool to achieve load balancing of millions of requests

Security audit penetration: bypassing corporate firewalls for white hat security testing

Typical request processing flow:

graph TD

A[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 Implementation

1. Basic request structure

curl -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 transmission

2. Proxy Integration Solution

curl -x "http://user:[email protected]:8080" \

--proxy-ntlm \

"https://target-site.com"

IP2world proxy service technical support:

Protocol adaptation: support HTTP/HTTPS/Socks5 proxy protocol

Authentication integration: NTLM/Basic/Digest authentication mode automatic negotiation

Connection pool optimization: TCP Keep-Alive maintains long connection reuse

3. Advanced debugging techniques

curl -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 threshold

3. Technical Challenges and Breakthroughs in Enterprise-Level Applications

1. Large-scale request scheduling

Distributed execution framework:

# Using GNU Parallel to implement concurrency control

parallel -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 strategy

curl -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 assurance

curl -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 transfer

ETag verification implements data version control

Time condition request to filter historical data

4. Performance Optimization in Engineering Practice

1. Connection layer optimization

curl --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 RTT

Disabling Nagle algorithm improves real-time performance

DNS pre-resolution bypasses query delays

2. Memory and CPU efficiency

curl --raw \

--no-buffer \

--max-time 30 \

--output /dev/null \

"https://streaming-api.com"

Resource control strategy:

Raw stream processing to avoid memory buffering

Timeout fuse to prevent zombie connections

Output redirection reduces I/O consumption

3. Automated monitoring system

#!/bin/bash

while true; do

latency=$(curl -w "%{time_total}\n" -o /dev/null -s "https://api.com")

if (( $(echo "$latency > 2.0" | bc -l) )); then

echo "$(date): High latency warning ($latency seconds)" >> monitor.log

# Automatically switch IP2world backup proxy

sed -i 's/proxyA.ip2world.com/proxyB.ip2world.com/' config.ini

fi

sleep 60

done

5. Deep integration with IP2world proxy service

1. Intelligent IP dispatching system

#!/bin/bash

API_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[]'); do

curl -x "socks5://$proxy" \

--fail-early \

--max-time 10 \

"https://target-site.com" && break

done

2. Enterprise-level security configuration

curl --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 auditing

curl --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"

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