Скачать или смотреть How to Reset Multipart Content-Type in a Chain of Rest Assured APIs

Learn how to effectively manage Content-Types in Rest Assured APIs, preventing errors associated with multipart requests and ensuring smooth API calls.
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This video is based on the question https://stackoverflow.com/q/69567028/ asked by the user 'Swapnil Surwase' ( https://stackoverflow.com/u/9262782/ ) and on the answer https://stackoverflow.com/a/69569031/ provided by the user 'lucas-nguyen-17' ( https://stackoverflow.com/u/7574461/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving Content-Type Issues in Rest Assured APIs

When working with chained REST APIs in a testing environment like Rest Assured, you might encounter issues related to different content types, especially when switching between multipart and application/json content types. This post aims to clarify the problem and provide a proficient solution.

The Problem at Hand

The specific issue arises when you send multiple API requests, each requiring different content types. Consider the following scenario:

First API with content type = JSON - works fine.

Second API with content type = JSON - works fine.

Third API with content type = Multipart - works fine.

Fourth API with content type = JSON - fails with an error.

Error Encountered

When the fourth API request is made, you may face the following error:

[[See Video to Reveal this Text or Code Snippet]]

This error occurs because the RequestSpecification configuration still retains the multipart content type set during the third API call, which causes the subsequent JSON request to fail.

Understanding the Root Cause

The core of the problem lies in the use of the RequestSpecification instance, which does not have a method to reset its state. This results in the content type from previous requests persisting into new requests improperly.

How RequestSpecification Works

RequestSpecification serves as a builder for constructing requests.

When you modify a RequestSpecification instance (like adding a multipart file), it mutates that instance.

As a result, you cannot easily revert to a previous state (like switching back to JSON).

The Effective Solution

To tackle this challenge, you should create distinct instances of RequestSpecification for each request. This approach prevents any residual settings from one request impacting another. Below is a simplified guide on implementing this solution.

Step-by-Step Implementation

Define Request Specifications: Create separate methods to build your RequestSpecification for both JSON and Multipart content types.

[[See Video to Reveal this Text or Code Snippet]]

Making API Calls: Use the distinct request specifications while making API calls. Here’s how it looks in practice:

[[See Video to Reveal this Text or Code Snippet]]

Summary

By utilizing separate RequestSpecification instances, you can effectively manage content types across multiple API requests in Rest Assured. This method prevents the unwanted inheritance of configurations that can lead to errors, streamlining the testing process significantly.

Conclusion

Managing various content types in chained API calls can be tricky, especially when working with different formats like JSON and Multipart. However, by implementing the outlined strategies and maintaining distinct request instances, you can avoid common pitfalls and enhance your API testing experience.

For anyone dealing with similar issues, I hope this guide proves helpful in resolving your Content-Type challenges in Rest Assured APIs.