DEV Community: Neutron

Answer: What does enctype='multipart/form-data' mean?

Neutron — Tue, 17 Mar 2020 12:50:42 +0000

answer re: What does enctype='multipart/form-data' mean?

Feb 7 '15

when should we use it

Quentin's answer is right: use multipart/form-data if the form contains a file upload, and application/x-www-form-urlencoded otherwise, which is the default if you omit enctype.

I'm going to:

add some more HTML5 references
explain why he is right with a form submit example

HTML5 references

…

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Answer: Error: Can't set headers after they are sent to the client

Neutron — Tue, 17 Mar 2020 12:05:36 +0000

answer re: Error: Can't set headers after they are sent to the client

Jan 6 '18

Some of the answers in this Q&A are wrong. The accepted answer is also not very "practical", so I want to post an answer that explains things in simpler terms. My answer will cover 99% of the errors I see posted over and over again. For the actual reasons behind…

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Answer: Error: Can't set headers after they are sent to the client

Neutron — Tue, 17 Mar 2020 12:04:26 +0000

answer re: Error: Can't set headers after they are sent to the client

Aug 17 '11

1135

The res object in Express is a subclass of Node.js's http.ServerResponse (read the http.js source). You are allowed to call res.setHeader(name, value) as often as you want until you call res.writeHead(statusCode). After writeHead, the headers are baked in and you can only call res.write(data), and…

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What is the 'new' keyword in JavaScript?

Neutron — Wed, 05 Feb 2020 10:17:14 +0000

answer re: What is the 'new' keyword in JavaScript?

Sep 7 '10

2161

It does 5 things:

It creates a new object. The type of this object is simply object.
It sets this new object's internal, inaccessible, [[prototype]] (i.e. __proto__) property to be the constructor function's external, accessible, prototype object (every function object automatically has a prototype property).
It makes the…

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