HTTP Request - Support other custom HTTP methods - MERGE

I’m submitting a …

[x] feature request

Current behavior Unable to use HTTP MERGE method/verb. throws new Error(‘Invalid request method. The method “${method}” is not supported.’);

According to:

  if (typeof method !== 'string') return method;

  switch (method.toUpperCase()) {
    case 'GET':
      return RequestMethod.Get;
    case 'POST':
      return RequestMethod.Post;
    case 'PUT':
      return RequestMethod.Put;
    case 'DELETE':
      return RequestMethod.Delete;
    case 'OPTIONS':
      return RequestMethod.Options;
    case 'HEAD':
      return RequestMethod.Head;
    case 'PATCH':
      return RequestMethod.Patch;
  }
  throw new Error(`Invalid request method. The method "${method}" is not supported.`);
}

https://github.com/angular/angular/blob/4.0.0/packages/http/src/http_utils.ts

Expected behavior Either:

1. Support HTTP MERGE method/verb in enum
2. Don’t block (throw error) if a ‘custom’ method not pre-defined is used.

What is the motivation / use case for changing the behavior? Whilst the library HTTP methods are compliant with the RFC https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html:

Not all established REST API’s on the web fully conform. For example, Microsoft Azure Table Storage (a NoSQL database) which uses MERGE.https://docs.microsoft.com/en-us/rest/api/storageservices/fileservices/merge-entity

[alxhub]

Hello @murraybauer,

This is currently planned for upcoming HTTP APIs.

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