Function applyRequestBody

packages/plugins/openapi/src/sdk/invoke.ts:742–818

(
  request: HttpClientRequest.HttpClientRequest,
  contentType: string,
  bodyValue: unknown,
  encoding: Record<string, EncodingObject> | undefined,
)

// ---------------------------------------------------------------------------

const applyRequestBody = (
  request: HttpClientRequest.HttpClientRequest,
  contentType: string,
  bodyValue: unknown,
  encoding: Record<string, EncodingObject> | undefined,
): HttpClientRequest.HttpClientRequest => {
  if (isJsonContentType(contentType)) {
    // Pre-serialized JSON strings pass through with the declared media
    // type preserved (important for `application/vnd.foo+json` etc.).
    if (typeof bodyValue === "string") {
      return HttpClientRequest.bodyText(request, bodyValue, contentType);
    }
    return HttpClientRequest.bodyJsonUnsafe(request, bodyValue);
  }

  if (isFormUrlEncoded(contentType)) {
    if (typeof bodyValue === "string") {
      return HttpClientRequest.bodyText(request, bodyValue, contentType);
    }
    if (typeof bodyValue === "object" && bodyValue !== null && !Array.isArray(bodyValue)) {
      // Serialize ourselves so OAS3 encoding (style/explode/deepObject)
      // is honored. bodyUrlParams doesn't know about per-field style.
      const serialized = serializeFormUrlEncoded(bodyValue as Record<string, unknown>, encoding);
      return HttpClientRequest.bodyText(request, serialized, contentType);
    }
    // Non-object body — fall back to platform helper (handles URLSearchParams).
    return HttpClientRequest.bodyUrlParams(
      request,
      bodyValue as Parameters<typeof HttpClientRequest.bodyUrlParams>[1],
    );
  }

  if (isMultipartFormData(contentType)) {
    if (bodyValue instanceof FormData) {
      return HttpClientRequest.bodyFormData(request, bodyValue);
    }
    if (typeof bodyValue === "object" && bodyValue !== null) {
      return HttpClientRequest.bodyFormDataRecord(
        request,
        coerceFormDataRecord(bodyValue as Record<string, unknown>, encoding),
      );
    }
    // String / primitive under multipart is almost certainly wrong on the
    // caller's end — send it as text with their declared content type and
    // let the server produce a useful error.
    return HttpClientRequest.bodyText(request, String(bodyValue), contentType);
  }

  if (isOctetStream(contentType)) {
    const bytes = toUint8Array(bodyValue);
    if (bytes) return HttpClientRequest.bodyUint8Array(request, bytes, contentType);
    if (typeof bodyValue === "string") {
      return HttpClientRequest.bodyText(request, bodyValue, contentType);
    }
    // Unknown shape — serialize as JSON so at least the payload is visible.
    return HttpClientRequest.bodyText(request, JSON.stringify(bodyValue), contentType);
  }