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Instructor: Now when discussing response code

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it's important to note they are divided into groups

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and there are actually five groups of response codes

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and each group represent a specific response type.

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So there is a group for success response codes

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and there is a group for error response codes, et cetera.

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Now each group consists of three digit status codes.

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So all the status codes

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that we are dealing with are always consist of three digits

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and each group has its own first digit.

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So you will see groups that start

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with one, with two, et cetera.

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So let's discuss the various groups of response code.

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So the first group is the group that starts

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with one and all the status code that starts

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with one represent informational response.

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The next group is the group that starts with two

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and all status code that starts with two represent success.

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The next one is three, represent redirection.

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Next come the fours that represent client errors.

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And the last one are the fives

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that represent server errors.

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Now the first one, the informational response,

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you should not use it.

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It is there only

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for informational purpose and no one is using it.

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So you should also avoid this group.

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In addition, the three group,

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the redirection is usually implemented

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by low level components such as whip server,

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operating systems and so on.

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You will rarely use this group in your API code.

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So for our discussion

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we will simply ignore those two groups

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and we will discuss those three,

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the success, client errors, and server errors.

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So let's begin with the success.