curl

How to use `curl` scripts to test RESTful web services

There may be better ways to do this, but when I was writing a mobile app, with the JavaScript client written in Sencha Touch and the server written with the Play Framework, I wrote some curl scripts to simulate GET, POST, DELETE, and PUT request (method) calls to my Play Framework REST/RESTful web 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: