# API Service Gateway Responses

Responses from API services available via the API Gateway will generally be in JSON format. If a service utilizes a different response format that will be documented with that specific service.

## CORS Support

Services provide support for Cross-Origin Resource Sharing (CORS). CORS is a mechanism that allows restricted resources on a web page to be accessed from another domain outside the domain from which the first resource was served (<https://en.wikipedia.org/wiki/Cross-origin_resource_sharing>)

{% code overflow="wrap" %}

```bash
curl -X OPTIONS --verbose --location 'https://api.scicrunch.io/elastic/v1/_cat/aliases' --header 'apikey: <<YOUR API KEY>>'
```

{% endcode %}

```
*   Trying 52.89.161.7:443...
* Connected to api.scicrunch.io (52.89.161.7) port 443
* ALPN: curl offers h2,http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
*  CAfile: /etc/pki/tls/certs/ca-bundle.crt
*  CApath: none
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-ECDSA-AES128-GCM-SHA256
* ALPN: server accepted http/1.1
* Server certificate:
*  subject: CN=api.scicrunch.io
*  start date: Feb  2 22:02:47 2024 GMT
*  expire date: May  2 22:02:46 2024 GMT
*  subjectAltName: host "api.scicrunch.io" matched cert's "api.scicrunch.io"
*  issuer: C=US; O=Let's Encrypt; CN=R3
*  SSL certificate verify ok.
* using HTTP/1.1
> OPTIONS /elastic/_cat/aliases HTTP/1.1
> Host: api.scicrunch.io
> User-Agent: curl/8.3.0
> Accept: */*
> apikey: <<YOUR API KEY>>
> 
< HTTP/1.1 200 OK
< Server: openresty/1.25.3.1
< Date: Tue, 06 Feb 2024 02:08:25 GMT
< Content-Type: application/json
< Content-Length: 0
< Connection: keep-alive
< Access-Control-Allow-Origin: *
< Access-Control-Allow-Methods: GET, POST, OPTIONS, HEAD
< Access-Control-Allow-Headers: Authorization, Origin, X-Requested-With, Content-Type, Accept
< 
* Connection #0 to host api.scicrunch.io left intact

```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.scicrunch.io/api-service-gateway-overview/api-service-gateway-responses.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.