diff --git a/src/storage/accessors/FileDataAccessor.ts b/src/storage/accessors/FileDataAccessor.ts
index 884950273..a07e4c37a 100644
--- a/src/storage/accessors/FileDataAccessor.ts
+++ b/src/storage/accessors/FileDataAccessor.ts
@@ -5,11 +5,13 @@ import type { Quad } from 'rdf-js';
 import type { Representation } from '../../http/representation/Representation';
 import { RepresentationMetadata } from '../../http/representation/RepresentationMetadata';
 import type { ResourceIdentifier } from '../../http/representation/ResourceIdentifier';
+import { getLoggerFor } from '../../logging/LogUtil';
 import { NotFoundHttpError } from '../../util/errors/NotFoundHttpError';
 import { isSystemError } from '../../util/errors/SystemError';
 import { UnsupportedMediaTypeHttpError } from '../../util/errors/UnsupportedMediaTypeHttpError';
 import { guardStream } from '../../util/GuardedStream';
 import type { Guarded } from '../../util/GuardedStream';
+import { parseContentType } from '../../util/HeaderUtil';
 import { joinFilePath, isContainerIdentifier } from '../../util/PathUtil';
 import { parseQuads, serializeQuads } from '../../util/QuadUtil';
 import { addResourceMetadata, updateModifiedDate } from '../../util/ResourceUtil';
@@ -22,6 +24,8 @@ import type { DataAccessor } from './DataAccessor';
  * DataAccessor that uses the file system to store documents as files and containers as folders.
  */
 export class FileDataAccessor implements DataAccessor {
+  protected readonly logger = getLoggerFor(this);
+
   protected readonly resourceMapper: FileIdentifierMapper;
 
   public constructor(resourceMapper: FileIdentifierMapper) {
@@ -303,8 +307,15 @@ export class FileDataAccessor implements DataAccessor {
       addResourceMetadata(metadata, childStats.isDirectory());
       this.addPosixMetadata(metadata, childStats);
       // Containers will not have a content-type
-      if (childLink.contentType) {
-        metadata.add(RDF.terms.type, toNamedTerm(`${IANA.namespace}${childLink.contentType}#Resource`));
+      const { contentType, identifier } = childLink;
+      if (contentType) {
+        // Make sure we don't generate invalid URIs
+        try {
+          const { value } = parseContentType(contentType);
+          metadata.add(RDF.terms.type, toNamedTerm(`${IANA.namespace}${value}#Resource`));
+        } catch {
+          this.logger.warn(`Detected an invalid content-type "${contentType}" for ${identifier.path}`);
+        }
       }
 
       yield metadata;
diff --git a/src/util/HeaderUtil.ts b/src/util/HeaderUtil.ts
index 590bf004b..be6269350 100644
--- a/src/util/HeaderUtil.ts
+++ b/src/util/HeaderUtil.ts
@@ -109,7 +109,9 @@ export interface ContentType {
 }
 
 // REUSED REGEXES
-const token = /^[a-zA-Z0-9!#$%&'*+-.^_`|~]+$/u;
+const tchar = /[a-zA-Z0-9!#$%&'*+-.^_`|~]/u;
+const token = new RegExp(`^${tchar.source}+$`, 'u');
+const mediaRange = new RegExp(`${tchar.source}+/${tchar.source}+`, 'u');
 
 // HELPER FUNCTIONS
 /**
@@ -218,8 +220,7 @@ function parseAcceptPart(part: string, replacements: Record<string, string>): Ac
   const [ range, ...parameters ] = part.split(';').map((param): string => param.trim());
 
   // No reason to test differently for * since we don't check if the type exists
-  const [ type, subtype ] = range.split('/');
-  if (!type || !subtype || !token.test(type) || !token.test(subtype)) {
+  if (!mediaRange.test(range)) {
     logger.warn(`Invalid Accept range: ${range}`);
     throw new BadRequestHttpError(
       `Invalid Accept range: ${range} does not match ( "*/*" / ( token "/" "*" ) / ( token "/" token ) )`,
@@ -438,6 +439,11 @@ export function parseContentType(input: string): ContentType {
   // Quoted strings could prevent split from having correct results
   const { result, replacements } = transformQuotedStrings(input);
   const [ value, ...params ] = result.split(';').map((str): string => str.trim());
+  if (!mediaRange.test(value)) {
+    logger.warn(`Invalid content-type: ${value}`);
+    throw new BadRequestHttpError(`Invalid content-type: ${value} does not match ( token "/" token )`);
+  }
+
   return parseParameters(params, replacements)
     .reduce<ContentType>(
     (prev, cur): ContentType => {
diff --git a/test/unit/http/auxiliary/RdfValidator.test.ts b/test/unit/http/auxiliary/RdfValidator.test.ts
index 16e3fe8f4..4d5062018 100644
--- a/test/unit/http/auxiliary/RdfValidator.test.ts
+++ b/test/unit/http/auxiliary/RdfValidator.test.ts
@@ -26,8 +26,8 @@ describe('An RdfValidator', (): void => {
   });
 
   it('validates data by running it through a converter.', async(): Promise<void> => {
-    converter.handleSafe = jest.fn().mockResolvedValue(new BasicRepresentation('transformedData', 'wrongType'));
-    const representation = new BasicRepresentation('data', 'content-type');
+    converter.handleSafe = jest.fn().mockResolvedValue(new BasicRepresentation('transformedData', 'wrong/type'));
+    const representation = new BasicRepresentation('data', 'content/type');
     const quads = representation.metadata.quads();
     // Output is not important for this Validator
     await expect(validator.handle({ representation, identifier })).resolves.toBeDefined();
@@ -39,7 +39,7 @@ describe('An RdfValidator', (): void => {
 
   it('throws an error when validating invalid data.', async(): Promise<void> => {
     converter.handleSafe = jest.fn().mockRejectedValue(new Error('bad data!'));
-    const representation = new BasicRepresentation('data', 'content-type');
+    const representation = new BasicRepresentation('data', 'content/type');
     await expect(validator.handle({ representation, identifier })).rejects.toThrow('bad data!');
     // Make sure the data on the readable has not been reset
     expect(representation.data.destroyed).toBe(true);
diff --git a/test/unit/http/input/BasicRequestParser.test.ts b/test/unit/http/input/BasicRequestParser.test.ts
index 2d385a1f5..5dc28a94d 100644
--- a/test/unit/http/input/BasicRequestParser.test.ts
+++ b/test/unit/http/input/BasicRequestParser.test.ts
@@ -16,7 +16,7 @@ describe('A BasicRequestParser', (): void => {
   let requestParser: BasicRequestParser;
 
   beforeEach(async(): Promise<void> => {
-    targetExtractor = new StaticAsyncHandler(true, 'target' as any);
+    targetExtractor = new StaticAsyncHandler(true, { path: 'target' });
     preferenceParser = new StaticAsyncHandler(true, 'preference' as any);
     metadataParser = new StaticAsyncHandler(true, undefined);
     conditionsParser = new StaticAsyncHandler(true, 'conditions' as any);
@@ -39,10 +39,10 @@ describe('A BasicRequestParser', (): void => {
     bodyParser.handle = ({ metadata }): any => ({ data: 'body', metadata });
     await expect(requestParser.handle({ url: 'url', method: 'GET' } as any)).resolves.toEqual({
       method: 'GET',
-      target: 'target',
+      target: { path: 'target' },
       preferences: 'preference',
       conditions: 'conditions',
-      body: { data: 'body', metadata: new RepresentationMetadata('target') },
+      body: { data: 'body', metadata: new RepresentationMetadata({ path: 'target' }) },
     });
   });
 });
diff --git a/test/unit/storage/accessors/FileDataAccessor.test.ts b/test/unit/storage/accessors/FileDataAccessor.test.ts
index a978d84cb..51d3ce687 100644
--- a/test/unit/storage/accessors/FileDataAccessor.test.ts
+++ b/test/unit/storage/accessors/FileDataAccessor.test.ts
@@ -5,6 +5,7 @@ import type { Representation } from '../../../../src/http/representation/Represe
 import { RepresentationMetadata } from '../../../../src/http/representation/RepresentationMetadata';
 import { FileDataAccessor } from '../../../../src/storage/accessors/FileDataAccessor';
 import { ExtensionBasedMapper } from '../../../../src/storage/mapping/ExtensionBasedMapper';
+import type { FileIdentifierMapper, ResourceLink } from '../../../../src/storage/mapping/FileIdentifierMapper';
 import { APPLICATION_OCTET_STREAM } from '../../../../src/util/ContentTypes';
 import { ConflictHttpError } from '../../../../src/util/errors/ConflictHttpError';
 import { NotFoundHttpError } from '../../../../src/util/errors/NotFoundHttpError';
@@ -26,6 +27,7 @@ now.setMilliseconds(0);
 
 describe('A FileDataAccessor', (): void => {
   const base = 'http://test.com/';
+  let mapper: FileIdentifierMapper;
   let accessor: FileDataAccessor;
   let cache: { data: any };
   let metadata: RepresentationMetadata;
@@ -33,7 +35,8 @@ describe('A FileDataAccessor', (): void => {
 
   beforeEach(async(): Promise<void> => {
     cache = mockFs(rootFilePath, now);
-    accessor = new FileDataAccessor(new ExtensionBasedMapper(base, rootFilePath));
+    mapper = new ExtensionBasedMapper(base, rootFilePath);
+    accessor = new FileDataAccessor(mapper);
 
     metadata = new RepresentationMetadata(APPLICATION_OCTET_STREAM);
 
@@ -192,6 +195,48 @@ describe('A FileDataAccessor', (): void => {
       }
     });
 
+    it('does not generate IANA URIs for children with invalid content-types.', async(): Promise<void> => {
+      cache.data = {
+        container: {
+          resource1: 'data',
+          resource2: 'badData',
+        },
+      };
+
+      const badMapper: jest.Mocked<FileIdentifierMapper> = {
+        mapFilePathToUrl: jest.fn(async(filePath: string, isContainer: boolean): Promise<ResourceLink> => {
+          const result = await mapper.mapFilePathToUrl(filePath, isContainer);
+          if (filePath.endsWith('resource2')) {
+            result.contentType = 'this is not a valid type';
+          }
+          return result;
+        }),
+        mapUrlToFilePath: jest.fn((...args): Promise<ResourceLink> => mapper.mapUrlToFilePath(...args)),
+      };
+
+      accessor = new FileDataAccessor(badMapper);
+
+      const children = [];
+      for await (const child of accessor.getChildren({ path: `${base}container/` })) {
+        children.push(child);
+      }
+
+      // Identifiers
+      expect(children).toHaveLength(2);
+      expect(new Set(children.map((child): string => child.identifier.value))).toEqual(new Set([
+        `${base}container/resource1`,
+        `${base}container/resource2`,
+      ]));
+
+      const types1 = children[0].getAll(RDF.type).map((term): string => term.value);
+      const types2 = children[1].getAll(RDF.type).map((term): string => term.value);
+
+      expect(types1).toContain('http://www.w3.org/ns/iana/media-types/application/octet-stream#Resource');
+      for (const type of types2) {
+        expect(type).not.toMatch(/^http:\/\/www\.w3.org\/ns\/iana\/media-types\//u);
+      }
+    });
+
     it('adds stored metadata when requesting metadata.', async(): Promise<void> => {
       cache.data = { resource: 'data', 'resource.meta': '<http://this> <http://is> <http://metadata>.' };
       metadata = await accessor.getMetadata({ path: `${base}resource` });
diff --git a/test/unit/storage/accessors/SparqlDataAccessor.test.ts b/test/unit/storage/accessors/SparqlDataAccessor.test.ts
index cbd7e4f81..0a7cd47cb 100644
--- a/test/unit/storage/accessors/SparqlDataAccessor.test.ts
+++ b/test/unit/storage/accessors/SparqlDataAccessor.test.ts
@@ -72,7 +72,7 @@ describe('A SparqlDataAccessor', (): void => {
   it('can only handle quad data.', async(): Promise<void> => {
     let representation = new BasicRepresentation(data, metadata, true);
     await expect(accessor.canHandle(representation)).rejects.toThrow(UnsupportedMediaTypeHttpError);
-    representation = new BasicRepresentation(data, 'newInternalType', false);
+    representation = new BasicRepresentation(data, 'internal/newInternalType', false);
     await expect(accessor.canHandle(representation)).rejects.toThrow(UnsupportedMediaTypeHttpError);
     representation = new BasicRepresentation(data, INTERNAL_QUADS, false);
     metadata.contentType = INTERNAL_QUADS;
diff --git a/test/unit/util/HeaderUtil.test.ts b/test/unit/util/HeaderUtil.test.ts
index 707251436..7c9368927 100644
--- a/test/unit/util/HeaderUtil.test.ts
+++ b/test/unit/util/HeaderUtil.test.ts
@@ -1,4 +1,5 @@
 import type { HttpResponse } from '../../../src/server/HttpResponse';
+import { BadRequestHttpError } from '../../../src/util/errors/BadRequestHttpError';
 import {
   addHeader,
   parseAccept,
@@ -213,6 +214,10 @@ describe('HeaderUtil', (): void => {
       contentTypePlain.parameters.test = 'value1';
       expect(parseContentType('text/plain; charset=utf-8;test="value1"')).toEqual(contentTypePlain);
     });
+
+    it('errors on invalid content-types.', (): void => {
+      expect((): any => parseContentType('invalid type')).toThrow(BadRequestHttpError);
+    });
   });
 
   describe('#parseForwarded', (): void => {
diff --git a/test/unit/util/ResourceUtil.test.ts b/test/unit/util/ResourceUtil.test.ts
index a78377c6f..f177f9658 100644
--- a/test/unit/util/ResourceUtil.test.ts
+++ b/test/unit/util/ResourceUtil.test.ts
@@ -10,7 +10,7 @@ describe('ResourceUtil', (): void => {
   let representation: Representation;
 
   beforeEach(async(): Promise<void> => {
-    representation = new BasicRepresentation('data', 'metadata');
+    representation = new BasicRepresentation('data', 'meta/data');
   });
 
   describe('#updateModifiedDate', (): void => {
@@ -55,7 +55,7 @@ describe('ResourceUtil', (): void => {
 
     it('ensures that original representation does not update when the clone is updated.', async(): Promise<void> => {
       const res = await cloneRepresentation(representation);
-      res.metadata.contentType = 'typetype';
+      res.metadata.contentType = 'type/type';
       expect(representation.metadata.contentType).not.toBe(res.metadata.contentType);
     });
   });