substitutor.substitute(returnType),
            receiverType?.let { substitutor.substitute(it) },
            valueParameters.map { valueParameter ->
                KtFe10VariableLikeSignature<KtValueParameterSymbol>(
                    valueParameter.symbol,
                    substitutor.substitute(valueParameter.returnType),
                    valueParameter.receiverType?.let { substitutor.substitute(it) }
                )
            }

* Nginx
* HAProxy

## Let's Encrypt

Before Let's Encrypt, these **HTTPS certificates** were sold by trusted third parties.

The process to acquire one of these certificates used to be cumbersome, require quite some paperwork and the certificates were quite expensive.

But then **<a href="https://letsencrypt.org/" class="external-link" target="_blank">Let's Encrypt</a>** was created.

            type.isDouble -> KtConstantValue.KtDoubleConstantValue((value as Number).toDouble(), expression)
            else -> null
        }

        return constantValue?.let { KtConstantAnnotationValue(it, analysisSession.token) }
    }

    private fun Collection<FirExpression>.convertVarargsExpression(
        builder: KtSymbolByFirBuilder,
    ): Pair<Collection<KtAnnotationValue>, KtElement?> {

    parameters.gradleVersion = moduleIdentity.version.map { it.version }
    parameters.homeDir = intTestHomeDir
}

fun Gradle.rootBuild(): Gradle = parent.let { it?.rootBuild() ?: this }

tasks.withType<DistributionTest>().configureEach {
    shouldRunAfter("test")

    setJvmArgsOfTestJvm()
    setSystemPropertiesOfTestJVM("default")
    configureGradleTestEnvironment()

private
fun hasFunctionFlags(functionsSupplier: Supplier<MutableList<KmFunction>>, jvmSignature: String, predicate: FlagsPredicate) =
    functionsSupplier.get().firstOrNull {
        jvmSignature == it.signature?.asString()
    }?.flags?.let { predicate(it) } ?: false


private

    (this as? FirResolvedNamedReference)?.resolvedSymbol

internal fun FirReference.getResolvedKtSymbolOfNameReference(builder: KtSymbolByFirBuilder): KtSymbol? =
    getResolvedSymbolOfNameReference()?.fir?.let(builder::buildSymbol)

internal fun FirErrorNamedReference.getCandidateSymbols(): Collection<FirBasedSymbol<*>> =
    diagnostic.getCandidateSymbols()

# Security - First Steps

Let's imagine that you have your **backend** API in some domain.

And you have a **frontend** in another domain or in a different path of the same domain (or in a mobile application).

And you want to have a way for the frontend to authenticate with the backend, using a **username** and **password**.

We can use **OAuth2** to build that with **FastAPI**.

        }

        resolvedSymbols.firstIsInstanceOrNull<KtCallableSymbol>()?.firSymbol?.let { availableCallable ->
            return canShorten(fqName, availableCallable.callableId.asSingleFqName()) { callableShortenStrategy(availableCallable) }
        }

        resolvedSymbols.firstIsInstanceOrNull<KtClassLikeSymbol>()?.firSymbol?.let { availableClassifier ->

        Pair(
            (node as? NodeWithJavadoc<*>)?.javadoc?.orElse(null)?.let { findVersionFromJavadoc(it) }
                // This is needed to find the JavaDoc of a package declaration in 'package-info.java'
                ?: (node as? PackageDeclaration)?.parentNode?.get()?.childNodes?.filterIsInstance<JavadocComment>()?.singleOrNull()?.parse()?.let { findVersionFromJavadoc(it) }
                ?: versionNotFound,

## Pin your `fastapi` version

The first thing you should do is to "pin" the version of **FastAPI** you are using to the specific latest version that you know works correctly for your application.

For example, let's say you are using version `0.45.0` in your app.

If you use a `requirements.txt` file you could specify the version with:

```txt
fastapi==0.45.0
```