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Support for application/x-www-form-urlencoded Content-Type as body type formdata currently only supports multipart/form-data #337

@AcousticDeveloper

Description

@AcousticDeveloper

Describe the bug/problem
Currently whenever the formdata is selected as request body, the Content-Type header is set to multipart/form-data but this should be dependent upon whether there is a file being uploaded too or else it can be set to the default application/x-www-form-urlencoded.

Relevant References
stackoverflow: application/x-www-form-urlencoded or multipart/form-data?
baeldung: Difference Between form-data, x-www-form-urlencoded and raw in Postman

Steps to Reproduce the bug/problem
Select POST request in the request method, select formdata as the request body, add only text fields as fields, and then we can either chck the codegen for languages where Content-Type is printed, or else we can print requestModel.requestBodyContentType.header inside codegen files to check the request header.

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Expected behavior
If there aren't any files uploaded i.e. all the fields are of text type and selected type is formdata, then the Content-Type should be set to application/x-www-form-urlencoded, and if there is at least one file in the form data, then the Content-Type should be multipart/form-data. As the default Content-Type for HTML form submission is application/x-www-form-urlencoded, hence it is worth introducing in API dash.

Reference: Mozilla Documentation
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Fixing this should start from introducing a new sub-type inside consts.dart file and then creating a new ContentType for the new type and setting up the Content Type based on whether there are any files associated with the request or not. Below are some code snippets from consts.dart which are to be modified to start working on this issue.

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Device Info (The device where you encountered this issue):

  • OS: Debian 12 WSL2 on Windows 11

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