Unsupported Media Type (unsupported_media_type)

HTTP 415Horizon RFC 7807 ProblemCode: unsupported_media_type

Type URI: https://orion.stellarchain.io/horizon-errors/unsupported_media_type

The request `Content-Type` header is not supported by this endpoint.

Quick Fix & Resolution

Set Content-Type: application/x-www-form-urlencoded (with body tx=<url_encoded_xdr>) or application/json.

Response Payload & SDK Handling

RFC 7807 JSON Response

{
  "type": "https://orion.stellarchain.io/horizon-errors/unsupported_media_type",
  "title": "Unsupported Media Type",
  "status": 415,
  "detail": "The request has an unsupported content type. Presently, the only supported content type is application/x-www-form-urlencoded."
}

TypeScript (@stellar/stellar-sdk)

import { Horizon } from '@stellar/stellar-sdk';

const server = new Horizon.Server('https://pubnet.stellarchain.io');

try {
  const res = await server.ledgers().limit(10).call();
} catch (err: any) {
  const problem = err?.response?.data;
  if (problem?.type === 'https://orion.stellarchain.io/horizon-errors/unsupported_media_type') {
    console.error('[unsupported_media_type] HTTP 415:', problem.detail, problem.extras);
  }
}

Go (horizonclient)

client := &horizonclient.Client{
    HorizonURL: "https://pubnet.stellarchain.io",
}
_, err := client.Root()
if hErr := horizonclient.GetError(err); hErr != nil {
    if hErr.Problem.Status == 415 {
        log.Printf("Problem (%s): %s - extras=%v", hErr.Problem.Type, hErr.Problem.Detail, hErr.Problem.Extras)
    }
}

cURL Diagnostic

curl -i -s "https://pubnet.stellarchain.io/" \
  -H "Accept: application/hal+json"

Common Root Causes

• Submitting POST /transactions without Content-Type: application/x-www-form-urlencoded or application/json.

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