feat: Make it possible to import .har files

[dukeofharen]

Feature Request

Describe the Feature Request

HAR stands for HTTP Archive. This is a JSON file format that is used to record interactions between a client and a server. Both request and response will be logged.

Read more:

• https://docs.gitlab.com/ee/user/application_security/api_fuzzing/create_har_files.html
• https://en.wikipedia.org/wiki/HAR_(file_format)

Most modern browsers (Firefox, Chrome, Edge etc.) support exporting the requests from the networks tab in the developer console to a .har file. In this new feature, the .har file can be uploaded to HttPlaceholder so stubs with the corresponding request conditions and the response writers will be added.

Firefox always copies both request and responses. Chrome has an option to copy the .har with only the requests (without response) or .har with both request and response. Both scenarios need to be supported.

HAR examples

Describe Preferred Solution

Describe Alternatives

Related Code

Additional Context

If the feature request is approved, would you be willing to submit a PR?
Yes / No (Help can be provided if you need assistance submitting a PR)