# Replace services

URL: https://docs.hanzo.ai/docs/openapi/ingress/put-ingress-services-by-id

> Creates or replaces one backend pool and hot-applies it.

`PUT /v1/ingress/services/{id}`

> [Ingress →](https://docs.hanzo.ai/docs/openapi/ingress) · [All API references →](https://docs.hanzo.ai/docs/openapi) · [Get started →](https://docs.hanzo.ai/docs/guides)

|               |                                                 |
| ------------- | ----------------------------------------------- |
| **Address**   | `https://api.hanzo.ai/v1/ingress/services/{id}` |
| **Method**    | `PUT`                                           |
| **Operation** | `put_ingress_services_by_id`                    |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY`          |

Creates or replaces one backend pool and hot-applies it. POST mints
an id when the body omits one; PUT takes the id from the URL, which wins over
any id in the body. A pool needs at least one backend and every backend URL
must be http(s)://host\[:port].

## Request

6 fields, body `application/json` (required).

| Field               | In   | Type               | Required | Description                                                                                                  |
| ------------------- | ---- | ------------------ | -------- | ------------------------------------------------------------------------------------------------------------ |
| `id`                | path | string             | yes      | ID identifies the pool within the org: \[A-Za-z0-9-\_.], at most 128 chars.                                  |
| `backends`          | body | ingress.Backend\[] | —        | Backends are the upstream servers to balance across: 1..32 of them.                                          |
| `backends[].url`    | body | string             | —        | URL is the upstream server, http(s)://host\[:port].                                                          |
| `backends[].weight` | body | integer (int64)    | —        | Weight is this member's share of the round-robin; must be >= 0.                                              |
| `id`                | body | string             | —        | ID identifies the pool within the org: \[A-Za-z0-9-\_.], at most 128 chars.                                  |
| `passHostHeader`    | body | boolean            | —        | PassHostHeader forwards the client's original Host header upstream instead of rewriting it to the backend's. |

## Response

| Status    | Body             | Meaning |
| --------- | ---------------- | ------- |
| `200`     | ingress.Upstream | ok      |
| `default` | problem-details  | refused |

`200` body — 5 fields.

| Field               | In   | Type               | Always | Description                                                                                                  |
| ------------------- | ---- | ------------------ | ------ | ------------------------------------------------------------------------------------------------------------ |
| `backends`          | body | ingress.Backend\[] | —      | Backends are the upstream servers to balance across: 1..32 of them.                                          |
| `backends[].url`    | body | string             | —      | URL is the upstream server, http(s)://host\[:port].                                                          |
| `backends[].weight` | body | integer (int64)    | —      | Weight is this member's share of the round-robin; must be >= 0.                                              |
| `id`                | body | string             | —      | ID identifies the pool within the org: \[A-Za-z0-9-\_.], at most 128 chars.                                  |
| `passHostHeader`    | body | boolean            | —      | PassHostHeader forwards the client's original Host header upstream instead of rewriting it to the backend's. |

Failure carries the platform error shape — see [Errors](https://docs.hanzo.ai/docs/errors).

## Examples

**CLI**

```bash
hanzo ingress services set <id>
```

**SDK**

**.ts**

```ts
import { Configuration, IngressApi } from 'hanzoai';

const api = new IngressApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.putIngressServicesById({ id: 'id', backends: [{"url":"<url>","weight":0}], id: "<id>" });
```

**.py**

```python
from hanzoai.cloud import ApiClient, Configuration
from hanzoai.cloud.api import IngressApi

client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"]))
result = IngressApi(client).put_ingress_services_by_id(id='id', backends=[{"url":"<url>","weight":0}], id="<id>")
```

**.go**

```go
cfg := hanzoai.NewConfiguration()
cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY"))
client := hanzoai.NewAPIClient(cfg)

resp, _, err := client.IngressAPI.PutIngressServicesById(context.Background()).Execute()
if err != nil {
	return err
}
```

**.rs**

```rust
use hanzo_client::apis::{configuration::Configuration, ingress_api};

let mut cfg = Configuration::new();
cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok();

let result = ingress_api::put_ingress_services_by_id(&cfg, Default::default()).await?;
```

**.java**

```java
import ai.hanzo.cloud.ApiClient;
import ai.hanzo.cloud.api.IngressApi;

ApiClient client = new ApiClient();
client.setBearerToken(System.getenv("HANZO_API_KEY"));

var result = new IngressApi(client).putIngressServicesById();
```

**HTTP**

```bash
curl -X PUT https://api.hanzo.ai/v1/ingress/services/<id> \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "backends": [
         {
           "url": "<url>",
           "weight": 0
         }
       ],
       "id": "<id>"
     }'
```

**MCP**

MCP reaches **ingress** through the `ingress` tool, which names its 18 operations with its own verbs — this one among them, under a name only MCP declares. `describe` explains any of them:

```bash
curl -X POST https://api.hanzo.ai/v1/mcp \
  -H "Content-Type: application/json" \
  -d '{
       "jsonrpc": "2.0",
       "id": 1,
       "method": "tools/call",
       "params": {
         "name": "describe",
         "arguments": {
           "op": "list_ingress_middlewares"
         }
       }
     }'
```

---

[Ingress API](https://docs.hanzo.ai/docs/openapi/ingress) · [All Hanzo APIs](https://docs.hanzo.ai/docs/openapi) · [Interactive reference](https://docs.hanzo.ai/docs/openapi/reference)