Articles about http | UserComp.com

Tech Support: Not Reaching Domain via HTTPS Server Behind PfSense Firewall

Resolve HTTPS domain resolution failures behind PfSense by fixing port forwarding, virtual host routing, and SSL certificate binding.

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Troubleshooting Intermittent Slow Response HTTP Traffic

Resolve intermittent slow HTTP response times by isolating bottlenecks in network latency, DNS resolution, and server-side processing.

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Why is my domain URL still rendering a 404 page after uninstalling nginx?

Resolve persistent 404 errors after uninstalling nginx by stopping the service, purging configuration files, and ensuring Apache binds to port 80.

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Troubleshooting Puppeteer's HTTP Login Request Failure

Resolve Puppeteer HTTP login 403 errors by verifying session cookies, extracting CSRF tokens, and checking request headers.

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Troubleshooting HTTP Server Not Accessible on Intranet with Static IPs

Resolve HTTP server inaccessibility on intranets with static IPs by verifying network interface configurations and firewall rules.

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Changing port in Apache httpd.conf listen not working

Resolve Apache failing to bind to a new port by checking for conflicts, updating firewall rules, and configuring SELinux contexts.

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No Way to Stream HTTP Response on React Native Android

Resolve React Native Android OutOfMemoryError by using react-native-fs to stream HTTP responses instead of buffering them entirely in memory.

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Accessing MacOS Host on Linux Container's VPN Network

Configure host routing, IP forwarding, and NAT to allow a macOS host to reach a Linux container's internal VPN network.

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Angular 13: Guide on Making POST Requests and Getting File Names

Extract file names from Content-Disposition headers in Angular 13 POST requests by configuring HttpClient with observe response and responseType blob.

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Invalid SSL Certificate for Wikimedia on LAN: Troubleshooting Guide

Resolve invalid SSL certificate errors for Wikimedia on LAN by syncing system time, checking proxy interception, and inspecting local DNS settings.

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Is DNS-over-HTTPS (DOH) Dependent on Regular DNS Queries?

Resolves the bootstrapping dependency where DNS-over-HTTPS requires standard UDP port 53 queries to locate the provider's IP address before establishing an encrypted connection.

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PHP file_put_contents: Failed to open stream: Permission denied

Resolves PHP file_put_contents permission denied errors by configuring www-data ownership and directory permissions for web server write access.

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Send Array List to Backend Using Angular: A Comprehensive Guide

Demonstrates how to send an array list to a backend server in Angular using HttpClient and POST requests.

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URLSession Returns HTTP Status Code 200 but Incomplete Response Body

Resolve incomplete response bodies from URLSession by implementing URLSessionDataDelegate to buffer streaming data chunks instead of relying on single-shot completion handlers.

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Determining if a Website Uses HTTP or HTTPS: Tools and Methods to Verify Information

Verify if a website uses HTTP or HTTPS by inspecting browser indicators, command-line tools like curl, and developer network tabs.

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Can Apache be gracefully restated without clearing the mod_cache_socache cache?

Preserve mod_cache_socache data during Apache configuration updates by using a graceful restart instead of a full service restart.

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JavaScript - ERR_EMPTY_RESPONSE

Resolve JavaScript ERR_EMPTY_RESPONSE by diagnosing server crashes, network interruptions, and CORS misconfigurations.

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Linux Local External Network Issue: Two Servers, One Database, One Host HTTP Server Connection

Resolve Linux HTTP server to database connectivity failures by verifying network reachability, firewall rules, and service binding configurations.

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Using Plex VPN Works with HTTPS, Not iOS Apps, on NAS Server

Resolve iOS Plex app connection failures caused by self-signed certificates by configuring valid TLS certificates on your NAS server.

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How to Make IP External Connection with Ubuntu

Configure Ubuntu with a static IP, set up router port forwarding, and adjust Apache to enable external web server access.

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Apache Reverse Proxy: Reroute URL to Docker Container in Local Network

Configure Apache to route external URLs to internal Docker containers using mod_proxy and VirtualHost directives for secure, centralized access.

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Is There Such a Thing as DNS Proxy?

A DNS proxy centralizes name resolution to enforce security policies, filter malicious domains, and optimize performance through caching.

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Is HTTPS Really Secure About the First Data Packet Transmitted?

Explains how TLS handshake encryption protects the first data packet from eavesdropping in HTTPS connections.

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Responsible Strategies to Improve Web Scrape Hits During Traffic Surges

Reduce web scraping failures during traffic surges by implementing polite throttling, CDN caching, and exponential backoff.

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Understanding curl: Way to write current time and output info

Resolve latency and obscuration in chunked HTTP responses by disabling buffering and decoding while adding per-line timestamps for real-time debugging.

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Showing Actual HTTP Error Message in Chrome Developer Tools

Resolve unclear HTTP errors in Chrome DevTools by viewing the server's actual response body in the Network tab.

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Edge Browser: How to Redirect HTTP to HTTPS Locally Served Webpage

Resolve Edge automatic HTTP to HTTPS redirect errors for local development servers lacking valid SSL certificates.

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Understanding Python's http.server with No Flags or Options

Solve the problem of quickly serving static files locally without complex configuration by using Python's built-in http.server module.

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HTTPS + Proxy = VPN? Exploring the Relationship Between Encryption, Proxy Servers, and Virtual Private Networks

Distinguish between HTTPS, proxy servers, and VPNs to select the appropriate security tool for your specific privacy and encryption needs.

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What is “X-Amzn-Trace-Id” in my Firefox request headers?

Explains that X-Amzn-Trace-Id is an AWS X-Ray header injected by load balancers for distributed tracing, not generated by Firefox.

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IT Support: IPTables Redirection Issue with Python HTTP Server on One Machine's IP Address

Resolve IPTables redirection issues for a Python HTTP server by explicitly allowing inbound traffic on ports 22 and 443 while dropping all other incoming connections.

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Lifecycle of HTTP request messages after being received

Explains the Linux kernel lifecycle of HTTP requests to help debug connectivity, optimize performance, and secure network services.

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Stream an MP4 file via HTTP in a QuickTime-compatible format using FFmpeg

Fix non-streamable MP4 files by moving the moov atom to the beginning using FFmpeg for QuickTime HTTP playback.

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How to Install SSL on XAMPP Self-Hosted Website

Resolve SSL configuration errors in XAMPP by generating self-signed certificates and updating Apache settings for local HTTPS access.

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How to Host a Local Server for Android Applications on Ubuntu

Configure Apache on Ubuntu to serve local backend services accessible by Android emulators or devices for testing without external hosting.

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How does the browser know that the website is using HTTPS for a TLS handshake to start?

Explains how browsers use the URL scheme and HSTS headers to determine when to initiate a TLS handshake for secure connections.

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Understanding Download Managers: Pulling Files via HTTP Range Header

Resolves interrupted downloads and bypasses server connection limits by using HTTP Range headers for parallel, resumable file transfers.

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SSH Session via Apache Web Page on Ports 80/443

Configure HAProxy or Stunnel to tunnel SSH traffic through Apache ports 80 and 443, bypassing restrictive firewalls that block standard SSH connections.

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Instagram iOS Access: HTTPS Website (Let's Encrypt) Troubleshooting

Resolve iOS HTTPS errors on Let's Encrypt sites by verifying the full certificate chain, synchronizing device time, and correcting DNS configurations.

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Apache ProxyPassReverse not forwarding location response

Fixes Apache ProxyPassReverse failing to rewrite backend redirect URLs by ensuring matching proxy paths and preserving host headers.

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Firefox Stuck on .htaccess Redirect? How to Fix It

Resolve Firefox infinite redirect loops caused by cached .htaccess 301 rules by clearing site-specific cookies and cache.

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HttpPlatformHandler Returns Random Port but Node is Set to 3000: A Fix

Fix connection failures by setting the PORT environment variable to 3000 in web.config so HttpPlatformHandler aligns with Node.js.

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Using a URL to Specify a Special IP Address for Domain Resolution

Override DNS resolution for a specific domain by adding an entry to the system hosts file.

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Two Subdomains on Same Public IP but Two Different Webservers

Configure Apache Name-Based Virtual Hosts and reverse proxies to host multiple subdomains on a single public IP.

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Using Proxy Services for HTTP Requests: A Technical Support Perspective

Configure HTTP clients to route requests through proxy services for anonymity, geo-bypassing, and rate limit avoidance.

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Fixing Invalid SSL Certificate Error for Wikimedia on My PC

Resolve invalid SSL certificate errors on Wikimedia by clearing browser cache, verifying system date and time synchronization, and checking for network interference.

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Certificate Authority Works in Linux but Fails in MacOS

Fixes macOS certificate trust failures for local CAs by configuring Keychain Access to always trust the certificate.

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Preventing Nginx from Modifying HTTP Headers during Reverse Proxy

Configure Nginx to preserve original HTTP headers and remove sensitive upstream response headers using proxy_set_header and proxy_hide_directives.

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Create a Cloud Function on GCP Console and Make an HTTP Request to a VM

Resolve connectivity issues between GCP Cloud Functions and VMs by configuring network access and implementing secure HTTP requests using Node.js.

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Is Using Passwordless WiFi Dangerous?

Explains how passwordless WiFi enables man-in-the-middle attacks and data theft by exposing unencrypted traffic, DNS queries, and local network protocols to interception.

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