curl

How to use curl scripts to test RESTful web services

Table of Contents1 - GET, POST, DELETE, and PUT examples2 - More POST examples3 - Headers returned by the server4 - Discussion5 - Summary

There may be better ways to do this, but as I’m writing a mobile app with the client written in Sencha Touch, and the server written with the Play Framework, I’ve written some curl scripts to simulate GET, POST, DELETE, and PUT request (method) calls to my Play Framework “RESTful” services.

How to use `curl` to get headers from a URL

Curl FAQ: How do I use curl to get the headers from a website URL?

Short answer: Use curl's -I option, like this:

$ curl -I URL

Here's a specific example, including a real URL and results:

How to use PHP curl and curl_setopt with JSON web services

Here are two PHP scripts I just wrote that use curl and curl_setopt. The first example makes a GET request, and the second example makes a POST request, and passes JSON data to the web service it accesses.

A PHP curl GET request

This first one makes an HTTP GET request and prints the data that is returned by the URL that it hits:

A curl script to perform a POST to an HTTP web service using JSON data

You can use the following curl script to POST JSON data to a web service:

curl \
  --header "Content-type: application/json" \
  --request POST \
  --data '{"symbol":"GOOG","price":"600.00"}' \
  http://localhost:8080/stocks/saveJsonStock

If you're familiar with the curl command, and JSON web services, this should make sense.

Here are links to other curl shell scripts I've written:

How to view HTTP headers from the command line using curl

I’ve been working a lot on the next generation web server for the alvinalexander.com website lately, and as I’m looking at different HTTP accelerators, I keep wanting/needing to look at the headers returned by my web pages. A simple way to look at the HTTP headers from the command line is with the curl command, like this:

curl -I http://example.com/

Running this command against the main Google website, I see output like this:

PHP ping script examples

While working on a shared hosting server, I found that the company I'm working with has disabled my access to the Unix/Linux ping command. Not to be deterred, I found several different ways to run a ping command with a PHP script.

Use the Net_Ping module

The first thing you can try to do is use the PHP PEAR Net_Ping module to get around this problem. In short, you install it like this:

pear install Net_Ping

Then use it like this:

A shell script to download a URL (and test website speed)

I've been having a problem with a GoDaddy website lately (see my GoDaddy 4GH performance problems page, and in an effort to get a better handle on both (a) GoDaddy website downtime and (b) GoDaddy 4GH performance, I wrote a Unix shell script to download a sample web page from my website.

To that end, I created the following shell script, and then ran it from my Mac every two minutes: