curl-verbose: Detailed output of curl's communication

Overview

`curl-verbose` provides a detailed view of all stages of a network request through `curl`'s `-v` option. This is particularly useful for web service development, API testing, and network troubleshooting.

Key Output Information

When you run `curl -v`, you can see the following information:

DNS resolution process
TCP/IP connection attempts and success status
Detailed SSL/TLS handshake information (certificates, protocol versions, etc.)
HTTP request headers sent by the client
HTTP response headers received from the server
Data transfer process and speed

Key Options

`curl-verbose` refers to `curl`'s `-v` option, along with other commonly used `curl` options.

Verbose Output and Related Options

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Description:

`curl-verbose` Executes the command.

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Usage Examples

How to use `curl -v` to check detailed communication information in various scenarios.

Basic Verbose Output

curl -v https://example.com

Displays detailed information about the request and response to the specified URL.

Verbose Output with Response Headers

curl -v -i https://example.com/api/data

Displays the request/response process along with the server's response headers explicitly.

Verbose Output Following Redirects

curl -v -L http://bit.ly/example

For short URLs or URLs with redirects, displays detailed information including the redirection process.

Verbose Output Ignoring SSL Certificate

curl -v -k https://self-signed-test.com

When SSL/TLS verification errors occur due to self-signed certificates, this option ignores verification and displays detailed information.

Verbose Output for POST Request

curl -v -X POST -d "key=value&param=data" https://api.example.com/submit

Checks the detailed communication process for a POST request, including the data being sent.

Installation

`curl-verbose` is not a separate package; it's an option of the `curl` command. Therefore, if `curl` is installed, you can use it immediately. `curl` is pre-installed on most Linux distributions. If it's not installed, you can install it using the following commands.

Debian/Ubuntu

sudo apt update && sudo apt install curl

Install `curl` using the APT package manager.

CentOS/RHEL/Fedora

sudo yum install curl
# or
sudo dnf install curl

Install `curl` using the YUM or DNF package manager.

Arch Linux

sudo pacman -S curl

Install `curl` using the Pacman package manager.

Tips & Precautions

Tips and precautions for effectively using `curl -v`.

Filtering and Saving Output

Since verbose output contains a large amount of information, it's recommended to filter the necessary information or save it to a file for analysis.

Use with `grep` to search for specific keywords: `curl -v https://example.com 2>&1 | grep "SSL"`
Use with `less` to view page by page: `curl -v https://example.com 2>&1 | less`
Redirect output to a file: `curl -v https://example.com > curl_verbose_output.log 2>&1`

Security Precautions

Be cautious as verbose output may contain sensitive information.

Sensitive information such as API keys, authentication tokens, and session IDs may be included in headers or the body. Exercise caution when using in public places or shared environments.
The `-k` option, which bypasses SSL/TLS certificate verification, should only be used for development/debugging purposes and never in production environments.

Debugging Utility

This is a very powerful tool for diagnosing various network and web service-related issues, including network connection problems, SSL/TLS handshake errors, HTTP header issues, and redirect loops.