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Fixing remove Content-Type when data is instance of FormData #3785

merged 1 commit into from Apr 1, 2022


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@norbertsongin norbertsongin commented May 7, 2021

Fixes #1603

Similar motivation as in #3289
Seems more logical to give freedom to the developer

@jasonsaayman jasonsaayman self-requested a review May 7, 2021
@jasonsaayman jasonsaayman self-assigned this May 7, 2021
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jasonsaayman commented May 14, 2021

Hi @norbertsongin please can you add a test to this that checks it works and does not break compatability

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iam-Akshat commented Aug 10, 2021

Is this open, I can't see the pull request

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JoniVR commented Sep 10, 2021

I agree with this Pull Request, I just spent 2 hours trying to figure out why I was getting a 415 on React Native. Similar issues have been reported, the assumption that the browser will set it anyways is not always correct (see React Native for example). I was looking to open this exact PR myself before finding this one.

Furthermore, "magic" behind the scenes behavior like this is really frustrating, because it makes it seem like a bug. I'm just trying to explicitly set a "Content-Type" to my request, and it's getting stripped for some reason, queue 2 hours of digging through the Issues and Source code :/

I'd love to see this merged. It'd be some great redemption 2 hours of my life I'll never get back.

@jasonsaayman How would one go about writing tests for this specific issue? It's just removing some code? Though it should possibly be a breaking change unfortunately as people are now assuming that it's automatically being removed, which might break existing uses, not sure?.

@jasonsaayman jasonsaayman merged commit 9b8e004 into axios:master Apr 1, 2022
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jasonsaayman added a commit that referenced this issue Apr 27, 2022

* Fixed posting FormData in browser environment by reverting #3785;

* Added ability to keep `Content-Type` header in non-standard browser environments;

* Added browser test of FormData posting using external HTTP service (;

Co-authored-by: Jay <>
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4 participants