When Ios upload image should delete charset=utf-8 in http request header content-type ,otherwise will cause bug

[Tim-Burbank]

Thank you for making a pull request ! Just a gentle reminder :)

1. If the PR is offering a feature please make the request to our "Feature Branch" 0.11.0
2. Bug fix request to "Bug Fix Branch" 0.10.9
3. Correct README.md can directly to master

[Tim-Burbank]

fix ios upload bugs

[Tim-Burbank]

fix ios upload image bug

[Traviskn]

Can you describe more about the bug that is caused by charset=utf-8 in the request header? How can we reproduce the bug? We have been uploading files from iOS without problems for some time.

[Tim-Burbank]

When i upload image to aliyun oss use 'Content-Type': 'multipart/form-data' , will cause a bug , they are not accept this header when upload image

[okb1100]

We also have the same problem.
Our server returns a response with status code 403 when Content-Type has charset=utf-8 along with multipart/form-data, no problems with Android since charset=utf-8 is appended only on iOS.
Also the error is not limited to image files, we are trying to upload text/plain files. Appending charset=utf-8 to Content-Type only on iOS is inconsistent and should be removed.

react-native version: 0.56
rn-fetch-blob version: 0.10.12

[mokai]

Similarly, because charset=utf-8 is added, 405 Status is returned when uploading images to Alibaba Cloud OSS.

react-native version: 0.59.5
rn-fetch-blob version: 0.10.15

[Traviskn]

charset=urf-8 has been removed by #310