4xx Client Error

HTTP 407 Proxy Authentication Required

The client must first authenticate itself with the proxy. Similar to 401, but indicates the authentication is needed for the proxy server, not the origin server.

Common Causes

  • Corporate proxy requiring login credentials
  • Proxy server rejecting unauthenticated requests
  • Proxy credentials expired or invalid

How to Fix

  1. 1Provide valid proxy authentication credentials
  2. 2Configure your client with the correct proxy username/password
  3. 3Contact your network administrator for proxy access

Example

HTTP 407 Proxy Authentication Required
GET http://example.com HTTP/1.1

→ 407 Proxy Authentication Required
→ Proxy-Authenticate: Basic realm="proxy"

Related Client Error Codes

400

Bad Request

401

Unauthorized

402

Payment Required

403

Forbidden

404

Not Found

405

Method Not Allowed

406

Not Acceptable

408

Request Timeout

409

Conflict

410

Gone

411

Length Required

412

Precondition Failed

413

Content Too Large

414

URI Too Long

415

Unsupported Media Type

416

Range Not Satisfiable

417

Expectation Failed

418

I'm a Teapot

421

Misdirected Request

422

Unprocessable Content

423

Locked

424

Failed Dependency

425

Too Early

426

Upgrade Required

428

Precondition Required

429

Too Many Requests

431

Request Header Fields Too Large

451

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