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RESTful APIs in the Real World Course 1 Tutorial
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PUT versus POST: one of those conversations you try
to have. It leads to broken friendships, rainy picnics, and sad-looking kittens. People are passionate about REST, and this is one of the really sensitive topics.
First, you can read the technical descriptions in the
document I mentioned earlier. It’s actually pretty cool stuff. But this is more than theory: you’ll need to know when to choose PUT and when to choose POST, so listen up!
Each HTTP method is said to be “safe” or “unsafe”. An HTTP method is “safe” if using it doesn’t modify anything on the server. Ok, yes, logs will be written and analytics collected, but “safe” methods should never modify any real data. GET and HEAD are “safe” methods.
Making a request with unsafe methods - like POST, PUT and DELETE -
change data. Actually, if you make a request with an unsafe method it
change anything. For example, if I try to update a programmer’s
to the value it already has, nothing happens.
The point is that if a client uses an unsafe method, it knows that this method may have consequences. But if it uses a safe method, that request won’t ever have consequences. You could of course write an API that violates this. But that’s dishonest - like showing a picture of ice cream and then giving people broccoli. I like brocolli, but don’t be a jerk.
Being “safe” affects caching. Safe requests can be cached by a client, but unsafe requests can’t be. But caching is a whole different topic!
Within the unsafe methods, we have to talk about the famous term: “idempotency”. A request is idempotent if the side effects of making the request 1 time is the same as making the request 2, 3, 4, or 1072 times. PUT and DELETE are idempotent, POST is not.
For example, if we make the PUT request from our test once, it updates the
to 2. If we make it again, the
will still be 2. If we make the PUT request 1 time or 10 times, the server always results in the same state.
Now think about the POST request in our test, and imagine for a second that the
doesn’t have to be unique, because that detail clouds things here unnecessarily.
April 17, 2015
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Here’s a letter to the
Hillary Clinton insists that “[t]here’s something wrong when CEOs make 300 times more than the typical worker” (“
Hillary Clinton Blasts Pay For CEOs, Hedge Fund Managers In Campaign Kickoff
,” April 15).
Well now. As a speaker Ms. Clinton is paid, on average, $300,000 per talk; as a speaker I am paid, on average, $1,000 per talk. As a speaker, therefore, Ms. Clinton is paid 300 times more than I am paid! Is “something wrong”? Is the market for speakers rigged unfairly in favor of famous and politically connected speakers such as Ms. Clinton, and against obscure and ordinary speakers such as me? Is Ms. Clinton part of a nefarious network of greedy speaker-insiders who profit unjustly at the expense of myself and other more-typical speakers by manipulating the speaker market? Should government intervene into the speaker market to remedy this 300-to-1 ratio in speaker fees? Would the amounts that event organizers pay me to speak go up if government ensures that Ms. Clinton’s speaker fee is pushed down?
Although I reject everything that Ms. Clinton stands for (and proclaims in her speeches!), I’m quite sure that her high fee accurately reflects the value to her audiences of having her speak, just as my modest fee accurately reflects my value as a public speaker. So unless Ms. Clinton is prepared to conclude, solely because her speaker pay is 300 times that of typical speakers, that she profits unjustly at my and othertypical speakers’ expense, she has no basis for asserting that a 300-to-1 differencein pay in other industries and lines of work is “wrong.”
Sincerely, Donald J. Boudreaux Professor of Economics and Martha and Nelson Getchell Chair for the Study of Free Market Capitalism at the Mercatus Center George Mason University Fairfax, VA 22030
Jon Murphy’s comment here reminds me that I wanted to append to this letter
this analysis from the
of Ms. Clinton’s claim
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Quotation of the Day…
Manuel Antonio National Park and the nearby town of Quepos arelocated on the Central Pacific Coast of Costa Rica. The rich biodiversity of this area, coupled with a wealth of activities make this a destination that offers something for everyone. It’s easy to spend your entire holiday in this area of the country!Manuel Antonio is the premier destination of the Central Pacific region offering a variety of small intimate hotels artistically built into a rainforest hillside between town and the popular Manuel Antonio National Park.
Visit Manuel Antonio National Park.
Manuel Antonio National Park
Manuel Antonio National Park (closed on Mondays) contains three beautiful beaches, casual forest trails, and a denserainforest teaming with animal life.In 2011, it was named by Forbes as one of the world’s most beautiful parks.
Explore Manuel Antonio Beaches.
The two main beaches inside the park,
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are about a 30-minute hike from the main entrance of the park. Playa Manuel Antonio is best known for its spectacular views, but if you’re looking to beat the crowds, venture a bit further down the main trail to Playa Espadilla Sur. Thebeachesof Manuel Antonioare singularly beautifulwithstunning, brightly-colored sunsets.The light sand beaches in the coastal park are popular for relaxing, swimming,snorkeling, and surf lessons.
Manuel Antonio Beach
Because of environmental restrictions, the hotels in the Manuel Antonio area are not beachfront but set cliff-side with sweeping views. Only a few
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Discover Rainforest Wildlife.
Costa Rica Squirrel Monkey from
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Manuel Antonio is the smallest park in the Costa Rica, but abundant withwildlife. Capuchin, Howler, and Squirrel Monkeys are some of the most social creatures in the park. Don’t feed them, and hold on to your snacks! You can also expect to see sloths, iguanas, agoutis, andhundreds of species of birds – just to name a few. Book an early morning guided tour of the park with a professional naturalist guide to avoid the crowds and increase your odds of seeing more wildlife.Naturalist guides have an eye and an ear for locating wildlife that mostpeople miss.
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