Modern APIs with FastAPI and Python Transcripts
Chapter: Course conclusion and review
Lecture: Review: Status codes and responses
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When everything goes right, all we have to do is return some piece of data, maybe a pydantic data model or a dictionary or something like that,
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And FastAPI will convert that over to the data that we're going to send back in JSON typically, and it's gonna send a 200
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all ok status could. But what happens if something goes wrong? We can't just return a different style of data.
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That's not enough. So what we're gonna do is actually return explicit responses from
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FastAPI. So here what we're doing is we're saying we're gonna try to do this processing and return
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a dictionary correctly. And if for some reason that doesn't work, we'll catch any validation errors and say,
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here is the error message and the status code, which is usually 400, but sometimes it's 404. And if something else goes wrong, like
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nothing we expected, but the server still crashed, we can convert that over to something like error processing,
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request status code 500 and log it and then send that back. So be sure to leverage this ability to send back meaningful http Status codes.
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Remember, "httpstatuses.com" tells you all about the different options, and you can go
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over there and pick the right one and use this style of programming here to send that back and have a meaningful, nice,
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well-behaved API. When something goes wrong, it tells you what went wrong rather than just crashing.