# OpenAPI Callbacks { #openapi-callbacks }

You could create an API with a *path operation* that could trigger a request to an *external API* created by someone else (probably the same developer that would be *using* your API).

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>:     Started reloader process [28720]
<span style="color: green;">INFO</span>:     Started server process [28722]
<span style="color: green;">INFO</span>:     Waiting for application startup.
<span style="color: green;">INFO</span>:     Application startup complete.
```

</div>

 * This class coordinates user operations across different authentication providers.
 */
public class AuthenticationManager {
    /** Array of authentication chains to process user operations. */
    protected AuthenticationChain[] chains = {};

    /**
     * Default constructor for AuthenticationManager.
     */
    public AuthenticationManager() {
        // Default constructor
    }

**FastAPI** 🚚 ⚫️ 🏪 👆, 👩‍💻. ✋️ ⚫️ 👟 🔗 ⚪️➡️ 💃.

///

### ⏭ & ⏮️ `response`

👆 💪 🚮 📟 🏃 ⏮️ `request`, ⏭ 🙆 *➡ 🛠️* 📨 ⚫️.

& ⏮️ `response` 🏗, ⏭ 🛬 ⚫️.

🖼, 👆 💪 🚮 🛃 🎚 `X-Process-Time` ⚗ 🕰 🥈 👈 ⚫️ ✊ 🛠️ 📨 & 🏗 📨:

{* ../../docs_src/middleware/tutorial001.py hl[10,12:13] *}

## 🎏 🛠️

👆 💪 ⏪ ✍ 🌖 🔃 🎏 🛠️ [🏧 👩‍💻 🦮: 🏧 🛠️](../advanced/middleware.md){.internal-link target=_blank}.

import org.apache.maven.api.annotations.Nonnull;

/**
 * A result of collecting, flattening, and resolving {@link DependencyCoordinates}s.
 * Dependency is the output of the <dfn>collection</dfn> process, which builds the graph of dependencies,
 * followed by <dfn>flattening</dfn> and <dfn>resolution</dfn>.
 * The version selection is done for each dependency during the collection phase.

                    return processAuthenticationData(request);
                } catch (final Exception e) {
                    if (logger.isDebugEnabled()) {
                        logger.debug("Failed to process a login request on AzureAD.", e);
                    }
                }
                return null;
            }

fail for reasons that are irrelevant when using external linking mode.

The final program will be a dynamic executable, so that cmd/link can avoid
needing to process arbitrary .o files. It only needs to process the .o
files generated from C files that cgo writes, and those are much more
limited in the ELF or other features that they use.

In essence, the _cgo_import.o file includes the extra linking

# under the License.
#

#
# Maven system properties
#
# The properties defined in this file will be made available through
# system properties at the very beginning of Maven's boot process.
#

maven.installation.conf = ${maven.home}/conf
maven.user.conf         = ${user.home}/.m2
maven.project.conf      = ${session.rootDirectory}/.mvn

# Comma-separated list of files to include.

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>:     Started reloader process [28720]
<span style="color: green;">INFO</span>:     Started server process [28722]
<span style="color: green;">INFO</span>:     Waiting for application startup.
<span style="color: green;">INFO</span>:     Application startup complete.
```

</div>

```
minio server http://host{1...16}/export{1...64}
```

## Architecture

Expansion of ellipses and choice of erasure sets based on this expansion is an automated process in MinIO. Here are some of the details of our underlying erasure coding behavior.