POST request magically transformed to GET request when POST endpoint is redirected

My steps:

1. Do axios.post(...) to http://example.com/api/post_endpoint
2. server responds 301 with http*s*://example.com/api/post_endpoint location
3. axios sends GET(!) request after redirection

[makc]

you have been warned:

[RubenVerborgh]

Note that @makc above cites the obsolete version of the HTTP 1.1 spec, RFC2616. The paragraph right before the highlighted one states that the user agent MUST NOT automatically redirect unless confirmed by the user, which is thus what libraries are obliged to follow for HTTP 1.1 compatibility.

The latest version, RFC7231, states that:

Automatic redirection needs to done with care for methods not known to be safe, as defined in Section 4.2.1, since the user might not wish to redirect an unsafe request.

—https://tools.ietf.org/html/rfc7231#section-6.4

For historical reasons, a user agent MAY change the request method from POST to GET for the subsequent request. If this behavior is undesired, the 307 (Temporary Redirect) status code can be used instead.

—https://tools.ietf.org/html/rfc7231#section-6.4.2

That spec text is cited in the source code referred to above.