Httpx

httpx Agent Skill

When to Use This Skill

Use this skill when:

• Probing a large list of hosts/subdomains to identify live HTTP/HTTPS services
• Extracting titles, status codes, tech stacks, or web server banners at scale
• Filtering large host lists by status code, content-length, or technology
• Feeding live host lists into nuclei or other scanning tools
• The user asks about httpx, HTTP probing, or web fingerprinting
• Detecting services by favicon hash (Shodan-style fingerprinting)
• Building reconnaissance pipelines with subfinder, nmap, amass, or nuclei

What httpx Does

httpx is a high-performance HTTP probing tool that sends HTTP requests to a list of targets and reports back rich metadata: status codes, content length, page title, web server, TLS certificate details, technology stack (via Wappalyzer-equivalent fingerprints), response time, and more. It is designed for scale — handling hundreds of thousands of hosts with configurable concurrency — and integrates natively with the rest of the ProjectDiscovery ecosystem.

Installation

Go install (recommended)

go install -v github.com/projectdiscovery/httpx/cmd/httpx@latest

Pre-built binary

VERSION=1.6.10
curl -sSL https://github.com/projectdiscovery/httpx/releases/download/v${VERSION}/httpx_${VERSION}_linux_amd64.zip \
  -o httpx.zip && unzip httpx.zip httpx && chmod +x httpx && sudo mv httpx /usr/local/bin/

Docker

docker pull projectdiscovery/httpx:latest
echo "example.com" | docker run --rm -i projectdiscovery/httpx:latest -title -tech-detect -status-code

Kali / apt

# Not in default Kali repos — use Go install above
sudo apt install -y golang && go install github.com/projectdiscovery/httpx/cmd/httpx@latest

Core Concepts

Input methods

• stdin pipe (most common in pipelines)
• -l flag for a file of hosts
• -u / -target for a single URL

Output modes

• Colorized stdout (default interactive)
• -o for plain file output
• -json / -jsonl for structured JSON
• -csv for spreadsheet-friendly output
• -silent + -o for clean file output with no noise

Probing behaviour

• Tries both HTTP and HTTPS unless told otherwise
• Follows redirects by default (configurable depth)
• Uses a custom user-agent (configurable)
• Rate limits per-host and globally configurable
• Response body read limited to -response-size-to-read bytes

CLI Reference

Basic probing

# Single host
httpx -u https://example.com

# List of hosts from file
httpx -l hosts.txt

# From stdin
cat subdomains.txt | httpx

# Probe a CIDR range (use with caution — very noisy)
httpx -l cidr.txt -p 80,443,8080,8443

Common output flags (combine freely)

httpx -l hosts.txt \
  -status-code   \    # -sc  : HTTP status code
  -title         \    # -t   : Page 
  -content-length\    # -cl  : Response body size
  -web-server    \    # -ws  : Server header
  -tech-detect   \    # -td  : Wappalyzer tech stack
  -response-time \    # -rt  : Time to first byte
  -ip            \    # -ip  : Resolved IP address
  -cname         \    # -cn  : CNAME chain
  -location      \    # -lc  : Redirect location
  -favicon       \    # -fh  : Favicon MD5 hash
  -tls-grab      \    # -tls : TLS cert details
  -hash sha256   \    # Body hash (md5, sha1, sha256, mmh3)
  -screenshot         # Screenshot page (requires headless Chrome)

Tech detection

# Identify CMS, frameworks, libraries, WAFs
httpx -l hosts.txt -tech-detect -silent

# Combined with title and status code
httpx -l hosts.txt -td -title -sc -silent -o results.txt

Status code filtering

# Only show 200 OK
httpx -l hosts.txt -mc 200

# Only show 2xx and 3xx
httpx -l hosts.txt -mc 200,301,302,307,403

# Filter OUT 404s
httpx -l hosts.txt -fc 404

# Multiple exclusions
httpx -l hosts.txt -fc 404,400,500

Content-length filtering

# Only responses larger than 0 bytes (filter empty responses)
httpx -l hosts.txt -ml 1

# Filter out responses matching exact content length (e.g., default 404 page)
httpx -l hosts.txt -fl 1234

# Minimum content length
httpx -l hosts.txt -ml 100

String / regex matching in response

# Match responses containing a string
httpx -l hosts.txt -ms "admin panel"

# Match via regex
httpx -l hosts.txt -mr "api_key|secret|token"

# Filter out responses containing a string
httpx -l hosts.txt -fs "maintenance mode"

# Filter via regex
httpx -l hosts.txt -fr "403 Forbidden|Access Denied"

Port scanning (HTTP-aware)

# Probe multiple ports per host
httpx -l hosts.txt -p 80,443,8080,8443,8888,9090,3000,4443

# Probe specific ports only
httpx -l hosts.txt -p 8080 -p 8443

# Probe all 65535 ports (slow — use targeted lists instead)
httpx -l hosts.txt -p 1-65535

Following redirects

# Follow up to 10 redirects (default is 10)
httpx -l hosts.txt -follow-redirects

# Disable redirect following
httpx -l hosts.txt -no-follow-redirects

# Only follow redirects within same host
httpx -l hosts.txt -follow-host-redirects

Custom headers and methods

# Add custom header
httpx -l hosts.txt -H "X-Forwarded-For: 127.0.0.1" -H "Authorization: Bearer TOKEN"

# Use POST method
httpx -l hosts.txt -x POST

# Send POST body
httpx -l hosts.txt -x POST -body '{"user":"admin","pass":"admin"}'

# Custom user agent
httpx -l hosts.txt -ua "Mozilla/5.0 (compatible; Googlebot/2.1)"

Rate limiting and concurrency

# Set number of concurrent threads (default 50)
httpx -l hosts.txt -c 100

# Rate limit: requests per second
httpx -l hosts.txt -rate-limit 100

# Rate limit per host
httpx -l hosts.txt -rate-limit-minute 60

# Timeout per request (seconds)
httpx -l hosts.txt -timeout 10

# Retries
httpx -l hosts.txt -retries 2

Output formats

# JSON (one object per line — JSONL)
httpx -l hosts.txt -json -o results.jsonl

# JSON with full response body
httpx -l hosts.txt -json -include-response -o full.jsonl

# CSV output
httpx -l hosts.txt -csv -o results.csv

# Silent (no progress, just results)
httpx -l hosts.txt -silent -o clean.txt

# Store response bodies to directory
httpx -l hosts.txt -store-response -store-response-dir ./responses/

# Store chain (all redirect responses)
httpx -l hosts.txt -store-chain

Favicon hash detection (Shodan-style)

# Get MMH3 favicon hash for a host
httpx -u https://example.com -favicon

# Batch favicon hashing
httpx -l hosts.txt -favicon -silent -json | jq -r '"\(.favicon) \(.url)"'

# Cross-reference hash against known fingerprints
# Known hashes: https://github.com/sansatart/scrapts/blob/master/shodan-favicon-hashes.csv
# Shodan query: http.favicon.hash:-247388890

TLS/Certificate inspection

# Grab TLS details
httpx -l hosts.txt -tls-grab -json | jq '.tls'

# Filter expired certs
httpx -l hosts.txt -tls-grab -json | \
  jq -r 'select(.tls.expired == true) | .url'

# Find certs expiring in 30 days
httpx -l hosts.txt -tls-grab -json | \
  jq -r 'select(.tls.not_after != null) | [.url, .tls.not_after] | @tsv'

Common Workflows

Workflow 1: Subfinder → httpx → nuclei (full recon pipeline)

# Step 1: enumerate subdomains
subfinder -d example.com -silent -o subdomains.txt

# Step 2: probe live web services
httpx -l subdomains.txt -silent -o live-hosts.txt

# Step 3: scan with nuclei for vulnerabilities
nuclei -l live-hosts.txt -t /root/nuclei-templates/ -o vulns.txt

Workflow 2: nmap → httpx enrichment

# Extract open HTTP ports from nmap XML
nmap -p 80,443,8080,8443 192.168.1.0/24 -oX scan.xml
# Parse IPs with open ports → feed to httpx
python3 -c "
import xml.etree.ElementTree as ET
tree = ET.parse('scan.xml')
for host in tree.findall('.//host'):
    ip = host.find('.//address[@addrtype=\"ipv4\"]').get('addr')
    for port in host.findall('.//port[@protocol=\"tcp\"]'):
        if port.find('state').get('state') == 'open':
            print(f'{ip}:{port.get(\"portid\")}')
" | httpx -sc -title -web-server -tech-detect -silent

Workflow 3: Bug bounty scope probing

# Enumerate + probe + deduplicate + enrich
subfinder -d target.com -all -silent | \
  dnsx -silent -a | \
  httpx -sc -cl -title -td -location -silent -json -o bounty-recon.jsonl

# Find juicy endpoints
cat bounty-recon.jsonl | jq -r 'select(.status_code == 200) | "\(.status_code) \(.content_length) \(.title) \(.url)"' | sort -k2 -rn | head -50

Workflow 4: Find admin panels

httpx -l hosts.txt -sc -title -silent | \
  grep -iE "(admin|dashboard|panel|login|console|management|portal)"

Workflow 5: Technology-based targeting

# Find WordPress sites
httpx -l hosts.txt -tech-detect -silent -json | \
  jq -r 'select(.tech[]? | test("WordPress";"i")) | .url'

# Find Apache Struts (high-value)
httpx -l hosts.txt -tech-detect -silent -json | \
  jq -r 'select(.tech[]? | test("Apache Struts";"i")) | .url'

Advanced Techniques

Probe with SNI/virtual host override

# Force HTTP Host header (vhost fuzzing)
httpx -u http://192.168.1.100 -H "Host: internal.example.com" -title -sc

Screenshot capturing (headless Chrome)

# Requires Chrome/Chromium in PATH
httpx -l hosts.txt -screenshot -screenshot-timeout 15 -screenshot-path ./screenshots/

Custom fingerprint matching (YAML extension)

# httpx uses wappalyzer fingerprints internally; add custom tech detection via response matching
httpx -l hosts.txt -mr "X-Powered-By: CustomApp" -ms "customapp_version"

Integration with Burp Suite

# Send all live hosts through Burp proxy
httpx -l hosts.txt -http-proxy http://127.0.0.1:8080 -sc -title

jq recipes for JSONL output

# All 200 OK URLs
cat results.jsonl | jq -r 'select(.status_code == 200) | .url'

# Group by status code
cat results.jsonl | jq -r '.status_code' | sort | uniq -c | sort -rn

# URLs with interesting tech
cat results.jsonl | jq -r 'select(.tech | length > 0) | "\(.url) \(.tech | join(", "))"'

# Sort by content length descending
cat results.jsonl | jq -r '[.url, .content_length] | @tsv' | sort -k2 -rn | head -20

Troubleshooting

| Problem | Cause | Fix | |---|---|---| | no such file or directory binary | Not in PATH | Add $(go env GOPATH)/bin to PATH | | Tech detection empty | Fingerprint DB not updated | Run httpx -update or reinstall | | Slow throughput | Default concurrency too low | Increase -c 200 or -c 500 | | TLS errors | Invalid certs on target | Add -no-verify flag | | Too many false positives | Redirect to login page | Use -fc 301,302 or -ms "keyword" | | Screenshot fails | Chrome not found | Install chromium-browser and ensure it's in PATH | | Rate limiting by target | Too aggressive | Use -rate-limit 10 -c 10 | | Large JSONL file hard to parse | Output too large | Filter with -mc 200 before -json |

# Debug single host
httpx -u https://example.com -debug -v

# Update templates / fingerprints
httpx -update

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> Built by Red Hound InfoSec — On-demand offensive security expertise for SMBs. > 20+ years of Fortune 500 experience. Penetration testing, attack surface analysis, and security consulting. > > redhound.us | GitHub | Book a consultation

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: jph4cks
• Source: jph4cks/redhound-arsenal
• License: MIT
• Homepage: https://redhound.us

Install and usage instructions live in the source repository linked above.