diff --git a/client/src/app/core/core-services/data-send.service.ts b/client/src/app/core/core-services/data-send.service.ts
index f3a362cf5..4a85a5715 100644
--- a/client/src/app/core/core-services/data-send.service.ts
+++ b/client/src/app/core/core-services/data-send.service.ts
@@ -26,7 +26,7 @@ export class DataSendService {
      * @param model The model to create.
      */
     public async createModel(model: BaseModel): Promise<Identifiable> {
-        const restPath = `rest/${model.collectionString}/`;
+        const restPath = `/rest/${model.collectionString}/`;
         return await this.httpService.post<Identifiable>(restPath, model);
     }
 
@@ -36,7 +36,7 @@ export class DataSendService {
      * @param model The model that is meant to be changed.
      */
     public async updateModel(model: BaseModel): Promise<void> {
-        const restPath = `rest/${model.collectionString}/${model.id}/`;
+        const restPath = `/rest/${model.collectionString}/${model.id}/`;
         await this.httpService.put(restPath, model);
     }
 
@@ -46,7 +46,7 @@ export class DataSendService {
      * @param model The model to partially update.
      */
     public async partialUpdateModel(model: BaseModel): Promise<void> {
-        const restPath = `rest/${model.collectionString}/${model.id}/`;
+        const restPath = `/rest/${model.collectionString}/${model.id}/`;
         await this.httpService.patch(restPath, model);
     }
 
@@ -56,7 +56,7 @@ export class DataSendService {
      * @param model the model that shall be deleted.
      */
     public async deleteModel(model: BaseModel): Promise<void> {
-        const restPath = `rest/${model.collectionString}/${model.id}/`;
+        const restPath = `/rest/${model.collectionString}/${model.id}/`;
         await this.httpService.delete(restPath);
     }
 }
diff --git a/client/src/app/core/core-services/http.service.ts b/client/src/app/core/core-services/http.service.ts
index 0265000d7..0866cf0b5 100644
--- a/client/src/app/core/core-services/http.service.ts
+++ b/client/src/app/core/core-services/http.service.ts
@@ -79,6 +79,10 @@ export class HttpService {
         }
 
         let url = path + formatQueryParams(queryParams);
+        if (url[0] !== '/') {
+            console.warn(`Please prefix the URL "${url}" with a slash.`);
+            url = '/' + url;
+        }
         if (this.OSStatus.isPrioritizedClient) {
             url = '/prioritize' + url;
         }
diff --git a/client/src/app/core/core-services/time-travel.service.ts b/client/src/app/core/core-services/time-travel.service.ts
index a9fa1b0f6..95498c0d5 100644
--- a/client/src/app/core/core-services/time-travel.service.ts
+++ b/client/src/app/core/core-services/time-travel.service.ts
@@ -94,9 +94,8 @@ export class TimeTravelService {
      * @returns the full history on the given date
      */
     private async getHistoryData(history: History): Promise<HistoryData[]> {
-        const historyUrl = '/core/history/';
         const queryParams = { timestamp: Math.ceil(+history.unixtime) };
-        return this.httpService.get<HistoryData[]>(environment.urlPrefix + historyUrl, null, queryParams);
+        return this.httpService.get<HistoryData[]>(`${environment.urlPrefix}/core/history/`, null, queryParams);
     }
 
     /**
diff --git a/client/src/app/core/repositories/agenda/speaker-repository.service.ts b/client/src/app/core/repositories/agenda/speaker-repository.service.ts
index f7dddad45..96ae27a2d 100644
--- a/client/src/app/core/repositories/agenda/speaker-repository.service.ts
+++ b/client/src/app/core/repositories/agenda/speaker-repository.service.ts
@@ -158,6 +158,6 @@ export class SpeakerRepositoryService {
      * @param suffix the desired speaker action
      */
     private getRestUrl(itemId: number, suffix: SpeakerAction): string {
-        return `rest/agenda/item/${itemId}/${suffix}/`;
+        return `/rest/agenda/item/${itemId}/${suffix}/`;
     }
 }
diff --git a/client/src/app/core/repositories/config/config-repository.service.ts b/client/src/app/core/repositories/config/config-repository.service.ts
index 505ab062f..9bf92ddeb 100644
--- a/client/src/app/core/repositories/config/config-repository.service.ts
+++ b/client/src/app/core/repositories/config/config-repository.service.ts
@@ -266,7 +266,7 @@ export class ConfigRepositoryService extends BaseRepository<ViewConfig, Config>
         updatedConfig.patchValues(viewConfig.config);
         updatedConfig.patchValues(config);
         // TODO: Use datasendService, if it can switch correctly between put, post and patch
-        await this.http.put('rest/' + updatedConfig.collectionString + '/' + updatedConfig.key + '/', updatedConfig);
+        await this.http.put(`/rest/${updatedConfig.collectionString}/${updatedConfig.key}/`, updatedConfig);
     }
 
     /**
diff --git a/client/src/app/core/repositories/history/history-repository.service.ts b/client/src/app/core/repositories/history/history-repository.service.ts
index d6b320eee..c552ed9f0 100644
--- a/client/src/app/core/repositories/history/history-repository.service.ts
+++ b/client/src/app/core/repositories/history/history-repository.service.ts
@@ -109,7 +109,7 @@ export class HistoryRepositoryService extends BaseRepository<ViewHistory, Histor
      * Sends a post-request to delete history objects
      */
     public async delete(): Promise<void> {
-        const restPath = 'rest/core/history/clear_history/';
+        const restPath = '/rest/core/history/clear_history/';
         await this.httpService.post(restPath);
     }
 
diff --git a/client/src/app/core/repositories/mediafiles/mediafile-repository.service.ts b/client/src/app/core/repositories/mediafiles/mediafile-repository.service.ts
index 5a30f63e0..60ba9beb1 100644
--- a/client/src/app/core/repositories/mediafiles/mediafile-repository.service.ts
+++ b/client/src/app/core/repositories/mediafiles/mediafile-repository.service.ts
@@ -66,9 +66,8 @@ export class MediafileRepositoryService extends BaseRepository<ViewMediafile, Me
      * @returns the promise to a new mediafile.
      */
     public async uploadFile(file: FormData): Promise<Identifiable> {
-        const restPath = `rest/mediafiles/mediafile/`;
         const emptyHeader = new HttpHeaders();
-        return this.httpService.post<Identifiable>(restPath, file, {}, emptyHeader);
+        return this.httpService.post<Identifiable>('`/rest/mediafiles/mediafile/', file, {}, emptyHeader);
     }
 
     /**
diff --git a/client/src/app/core/repositories/motions/category-repository.service.ts b/client/src/app/core/repositories/motions/category-repository.service.ts
index 836348d12..0bcac6f3e 100644
--- a/client/src/app/core/repositories/motions/category-repository.service.ts
+++ b/client/src/app/core/repositories/motions/category-repository.service.ts
@@ -77,8 +77,7 @@ export class CategoryRepositoryService extends BaseRepository<ViewCategory, Cate
      * @param motionIds the list of motion ids on this category
      */
     public async numberMotionsInCategory(category: Category, motionIds: number[]): Promise<void> {
-        const collectionString = 'rest/motions/category/' + category.id + '/numbering/';
-        await this.httpService.post(collectionString, { motions: motionIds });
+        await this.httpService.post(`/rest/motions/category/${category.id}/numbering/`, { motions: motionIds });
     }
 
     /**
@@ -88,8 +87,7 @@ export class CategoryRepositoryService extends BaseRepository<ViewCategory, Cate
      * @param motionIds the list of motion ids on this category
      */
     public async sortMotionsInCategory(category: Category, motionIds: number[]): Promise<void> {
-        const collectionString = 'rest/motions/category/' + category.id + '/sort/';
-        await this.httpService.post(collectionString, { motions: motionIds });
+        await this.httpService.post(`/rest/motions/category/${category.id}/sort/`, { motions: motionIds });
     }
 
     /**
diff --git a/client/src/app/core/repositories/motions/motion-comment-section-repository.service.ts b/client/src/app/core/repositories/motions/motion-comment-section-repository.service.ts
index 64260501e..bf546746a 100644
--- a/client/src/app/core/repositories/motions/motion-comment-section-repository.service.ts
+++ b/client/src/app/core/repositories/motions/motion-comment-section-repository.service.ts
@@ -90,7 +90,7 @@ export class MotionCommentSectionRepositoryService extends BaseRepository<
      * Updates the comment. Saves it on the server.
      */
     private async updateComment(motion: ViewMotion, section: ViewMotionCommentSection, comment: string): Promise<void> {
-        return await this.http.post(`rest/motions/motion/${motion.id}/manage_comments/`, {
+        return await this.http.post(`/rest/motions/motion/${motion.id}/manage_comments/`, {
             section_id: section.id,
             comment: comment
         });
@@ -100,6 +100,6 @@ export class MotionCommentSectionRepositoryService extends BaseRepository<
      * Deletes a comment from the server
      */
     private async deleteComment(motion: ViewMotion, section: ViewMotionCommentSection): Promise<void> {
-        return await this.http.delete(`rest/motions/motion/${motion.id}/manage_comments/`, { section_id: section.id });
+        return await this.http.delete(`/rest/motions/motion/${motion.id}/manage_comments/`, { section_id: section.id });
     }
 }
diff --git a/client/src/app/core/repositories/motions/workflow-repository.service.ts b/client/src/app/core/repositories/motions/workflow-repository.service.ts
index 5f4587a35..de76550d3 100644
--- a/client/src/app/core/repositories/motions/workflow-repository.service.ts
+++ b/client/src/app/core/repositories/motions/workflow-repository.service.ts
@@ -29,7 +29,7 @@ export class WorkflowRepositoryService extends BaseRepository<ViewWorkflow, Work
     /**
      * The url to state on rest
      */
-    private restStateUrl = 'rest/motions/state/';
+    private restStateUrl = '/rest/motions/state/';
 
     /**
      * Creates a WorkflowRepository
diff --git a/client/src/app/core/repositories/users/user-repository.service.ts b/client/src/app/core/repositories/users/user-repository.service.ts
index 04ea6240b..bcea4ed7f 100644
--- a/client/src/app/core/repositories/users/user-repository.service.ts
+++ b/client/src/app/core/repositories/users/user-repository.service.ts
@@ -116,7 +116,7 @@ export class UserRepositoryService extends BaseRepository<ViewUser, User> {
         const data = newEntries.map(entry => {
             return { ...entry.newEntry.user, importTrackId: entry.importTrackId };
         });
-        const response = (await this.httpService.post(`rest/users/user/mass_import/`, { users: data })) as {
+        const response = (await this.httpService.post(`/rest/users/user/mass_import/`, { users: data })) as {
             detail: string;
             importedTrackIds: number[];
         };
diff --git a/client/src/app/core/ui-services/media-manage.service.ts b/client/src/app/core/ui-services/media-manage.service.ts
index b98957b83..ce5871e56 100644
--- a/client/src/app/core/ui-services/media-manage.service.ts
+++ b/client/src/app/core/ui-services/media-manage.service.ts
@@ -60,7 +60,7 @@ export class MediaManageService {
      * @param action determines the action
      */
     public async setAs(file: ViewMediafile, action: string): Promise<void> {
-        const restPath = `rest/core/config/${action}/`;
+        const restPath = `/rest/core/config/${action}/`;
 
         const config = this.getMediaConfig(action);
         const path = config.path !== file.downloadUrl ? file.downloadUrl : '';
diff --git a/client/src/app/core/ui-services/personal-note.service.ts b/client/src/app/core/ui-services/personal-note.service.ts
index a53529174..d6852173e 100644
--- a/client/src/app/core/ui-services/personal-note.service.ts
+++ b/client/src/app/core/ui-services/personal-note.service.ts
@@ -95,9 +95,9 @@ export class PersonalNoteService {
      */
     private async savePersonalNoteObject(pnObject: Partial<PersonalNoteObject>): Promise<void> {
         if (!pnObject.id) {
-            await this.http.post('rest/users/personal-note/', pnObject);
+            await this.http.post('/rest/users/personal-note/', pnObject);
         } else {
-            await this.http.put(`rest/users/personal-note/${pnObject.id}/`, pnObject);
+            await this.http.put(`/rest/users/personal-note/${pnObject.id}/`, pnObject);
         }
     }
 }