What happened?
The A2A server does not set the Content-Type: application/json header when sending push notifications, leading to a 415 Unsupported Media Type error. This occurs because the request defaults to application/octet-stream, which is not accepted by the client.
Relevant code: io.a2a.server.tasks.BasePushNotificationSender#dispatchNotification
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private boolean dispatchNotification(Task task, PushNotificationConfig pushInfo) { |
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String url = pushInfo.url(); |
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String token = pushInfo.token(); |
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A2AHttpClient.PostBuilder postBuilder = httpClient.createPost(); |
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if (token != null && !token.isBlank()) { |
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postBuilder.addHeader(X_A2A_NOTIFICATION_TOKEN, token); |
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} |
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String body; |
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try { |
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body = Utils.OBJECT_MAPPER.writeValueAsString(task); |
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} catch (JsonProcessingException e) { |
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LOGGER.debug("Error writing value as string: {}", e.getMessage(), e); |
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return false; |
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} catch (Throwable throwable) { |
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LOGGER.debug("Error writing value as string: {}", throwable.getMessage(), throwable); |
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return false; |
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} |
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try { |
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postBuilder |
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.url(url) |
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.body(body) |
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.post(); |
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} catch (IOException | InterruptedException e) { |
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LOGGER.debug("Error pushing data to " + url + ": {}", e.getMessage(), e); |
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return false; |
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} |
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return true; |
Relevant log output
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