fix(healthcare): set responseType to JSON instead of Buffer in searchFhirResourcesPost.js

[angelcaamal]

Description

Fixes #

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
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• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
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[gemini-code-assist]

Summary of Changes

Hello @angelcaamal, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a potential issue in the searchFhirResourcesPost.js sample by ensuring that the HTTP client correctly interprets the response as JSON. By explicitly setting the responseType to json, the sample will reliably parse the FHIR resource search results, preventing errors that might arise from default or incorrect response type handling.

Highlights

• Healthcare FHIR Sample Fix: Explicitly set the responseType to 'json' for the client request in searchFhirResourcesPost.js to ensure proper parsing of FHIR resource search results.

Changelog

• healthcare/fhir/searchFhirResourcesPost.js
  • Set the responseType option to 'json' for the client request.

Activity

• Author angelcaamal initiated the pull request with a detailed description and a comprehensive checklist, indicating a thorough review of contribution guidelines, testing, and linting.
• The author has completed several checklist items, including following contribution guidelines, passing tests and lint checks, and confirming CI test requirements.

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[gemini-code-assist]

Code Review

This pull request correctly addresses an issue where the response from a POST-based FHIR resource search was not being parsed as JSON. The change adds responseType: 'json' to the request options, ensuring the response data is a JSON object as expected. This is a good fix. However, there appears to be a related issue in the sample. The Content-Type header is set to application/fhir+json. According to the Google Cloud Healthcare API documentation for FHIR, POST-based searches should use Content-Type: application/x-www-form-urlencoded. Using the wrong content type might lead to search parameters not being correctly interpreted by the server. While this is outside the scope of the current changes, it's a potential bug in the sample that should be addressed.